Education and Safe Educational Environment Essay Example for Free

Education and Safe Educational Environment Essay Rights talk seeps into spheres of American society where a sense of personal responsibility and of civic obligation traditionally have been nourished. An intemperate rhetoric of personal liberty in this way corrodes the social foundations on which individual freedom and security ultimately rest. Because I agree with this quote, I firmly resolve the resolution that establishing a safe educational environment for grades K-12 justifies the infringement of civil liberties. I would like to offer the following definitions: Establish: to make firm or secure Safe Educational Environment: an environment conducive to learning where students are free from hurt, injury or loss Justifies: to demonstrate to be right, just, or valid Infringement: an encroachment, as of a right or privilege Civil Liberties: fundamental individual rights, such as freedom of speech and religion, protected by law against unwarranted governmental or other interference The value that the affirmative upholds is education. The value criterion I will use to uphold my value is safety. Safety is extremely important on any educational institute because it allows the students and faculty to learn and operate without any threat hanging over them. To explain my position, I offer the following contentions: Contention 1: Without the establishment of a safe learning environment, the ability to learn and to teach is severely hampered. Without a safe educational environment, the attainment of knowledge is difficult to achieve. As Michael Ferraraccio said, If schools cannot operate in a violence-free atmosphere, then education will suffer, a result which ultimately threatens the well being of everyone. An infringement of a students civil liberties is required to be able to maintain a safe and enjoyable learning atmosphere for both the students and the faculty. When a student does not feel secure in their learning area, they are often distracted and unable to focus. For example, a student cannot possibly concentrate if another classmate is spewing insults and cuss words at the teacher. However, if we allowed students the freedom of speech, this could be common place. Contention 2: Moral obligation to provide safe schools Donald Beci stated Because a state requires compulsory school attendance, it has a moral duty to maintain student discipline and to protect children from violence that occurs while they are attending the very schools to which the state has bound them to attend. A school is required to protect the children that it harbors, and thus some civil liberties must not be granted. Examples of these are the right to bear arms and the right to privacy, which could be construed to mean very dangerous things by students not mature enough to understand them. Also, privacy rights must not be granted in school, as it might endanger the safety of others. In fact, Donald Beci also says that, In situations where the school administration and students share joint control of lockers, desks, or other school property, the students would not have a legitimate expectation of privacy in such property; thus, in the abscence of privacy, Fourth Amendment requirements would be inapplicable. Thus schools must disregard some civil rights to uphold the value of safety which most of them abide by. The affirmative has proven that schools must disregard students civil rights in order to ensure a good and safe learning environment.

Vinegar as a Rust Remover | Experiment

Vinegar as a Rust Remover | Experiment Abstract Despite the vast research regarding rusting, still many people do not recognize the harmful effect it can to environment and to take precaution measure to avoid or prevent rusting. Results of study show U.S. had to spend total $276 billion, approximately 3.1% of the nations Gross Domestic Product (GDP) for corrosion direct cost. Therefore, these study is to find optional of artificial way to remove rusting from any other metal. For my research, I choose vinegar as a substance that has the potential to remove the rust stain from metal due to presence of acid in its content. Vinegar is easy to be obtained and usually use as households. I choose three different types of vinegar brands and analyzed its percentage by mass of acetic acid using acid-base titration technique. Then, I test the strength of each vinegar on rate of removing rust on rusted iron nail by removing the rust form. After that, I compare which vinegar has the highest rate of removing rust compared to its percentage by mass of acetic acid. As the result, I found out that different type of vinegar has different percentage by mass of acetic acid. But my experiment shows that, the higher percentage of acetic mass in the vinegar content, does not always lead to high rate of rust stain removal. These maybe due to my limitation of the research because I assumed that only acetic acid in vinegar reacts with the iron(III) oxide. Still, my research able to prove that vinegar can act as a potential rust stain remover but in low degree because acetic acid is weak acid. My research could help and provide people an easy way to remove rust from their accessories as vinegar could be easily obtained. 1. Introduction Vinegar can be define as a sour liquid obtained by result through acetic fermentation of dilute alcoholic liquids and used as a condiment or preservative. Aside from utilized widely, vinegar also can accommodate more than one purpose which usually used to enhance food taste. Vinegar is made through two stage of biological processes. These distinct process resulted from the action of innocuous microorganisms. In these process, yeast and Acetobacter is used to convert sugars (carbohydrates) into acetic acid. The first stage of process is called alcoholic fermentation. It occurs when yeasts convert natural sugars to alcohol under controlled conditions. In the second stage of process, Acetobacter which is a group of bacteria, changes the alcohol resulted from alcoholic fermentation to acid. This is the acid fermentation that forms vinegar. Since vinegar can be made from anything with sugar, there are probably too many variants to count made in countries throughout the world.[1](Kellen, 2 005, Vinegar Institute Site) Rust is define as the red or orange coating that forms on the surface of iron when exposed to air and moisture surroundings, consisting mass of ferric hydroxide. These ferric oxide is formed through oxidation. Rust forms due to the reaction of oxygen dissolved in dihydrogen monoxide(water) with iron. Rust also can be known or called as corrosion of metal.[2] (Holleman, Wiberg, 2001 Inorganic Chemistry Academic Press: San Diego) Rust is a general term to describe several different oxides that formed when an iron undergo corrosion. Some of the oxides are Fe(OH)2, Fe(OH)3, FeO(OH), and Fe2O3.H2O. The prevalent rust that can be found is a reddish-brown, Fe2O3.H2O. The oxygen in the air dissolve in water and promote the rust to start to compose. The rust also can be determine as an electrochemical process. The process of exchange of electrons (electricity) is conducted by chemical reactions in part of the electrical circuit. The surface of metal that exposed to electrolyte will undergo series of chemical reactions. Oxidation reactions (corrosion) occur at the surface of the anode while reduction reactions occur at the surface of the cathode.[3] (Jones, Denny (1996)  Principles and Prevention of Corrosion.) By observation, we could descried that rust occurs very easily because the presence of air and water or wet condition virtually presence anywhere. We could see around ourselves rusting is occur greatly. Rust changes steel into a different material, one that is impuissant or weaker than the original steel. Rusting is a immensely colossal problembecause so many things people use every day are made out of steel, like cars, bicycles, trucks, bridges, roofs, holding tanks, machinery, nuts, and bolts. When these objects are unprotected and exposed to water, they rust, and this damage can costs a lot of money. Rust also dangerous to human because a rusting iron nail can cause health issue such as tetanus if the iron nail pierce to human skin. Yet steel perpetuates to be widely used because it has an excellent strength-to-weight ratio. Also known as the best of all the common building materials. In addition, it is non-flammable, resistant to mold and termites, does not expand or contract und er temperature changes, and can be made with a consistent quality.[4] (Miller, L. (2003, July 31).  Corrosion). Therefore, we must take alert and precaution about rusting of these iron metal. The topic that be investigated in this extended essay is about rusting or corrosion and the way to prevent rust. Thus, my research question is to analyse the percentage by mass of acetic acid in different type of vinegar brands by using titration method and to investigate the potential of vinegar as rust stain remover. Therefore, my extended essay required two experimental procedures. My hypothesis for first experiment is that different types of vinegars have different percentage by mass of acetic acid. If the result of experiment one parallel with my hypothesis, second experiment could be carried out which is to investigate the potential of vinegar as rust stain remover. My hypothesis for second experiment is that the higher the percentage by mass of acetic acid in vinegar, the more efficient the vinegar to act as rust stain remover. The significant of my research is to investigate a cheapest and easiest way to remove rust. In this research, I choose vinegar as the potential method to remove stain rust because vinegar contain acetic acid . Vinegar could be easily found and present almost in every living house. Because acid is corrosive, it occur to me that the acid could corrode the rust stain from metal. To test the validity of my statement, a research and experimental procedure is carried out to justify the validity of my research question. The chosen area of study is rusting since my experiment focus more on rusting. These experiments included several methods such as acid base titration. Vinegar is acidic. Therefore, it will be titrated with base solutions, sodium hydroxide. The titration method is carried out to find the volume of base needed to neutralize the acid solution of vinegar. These method is essential for the experiment to find the percentage by mass of acetic acid in vinegar. Second method is rusting of iron nail. I could not choose any random iron nail to conduct my experiment because the result will not be accurate and precise as they could have different degree of rusting. Therefore, I buy iron nails that not rusted yet and undergo experimental procedure for the iron nails to rust under constant condition. These method needed to carry out so that the iron nails undergo rusting in constant activity. Then, the iron nails could be tested with the vinegar. In my experiment, I used some instrument from the chemistry laboratory. The instruments I used is pH meter. The pH meter is used to find the pH of different type of vinegar. I also use burette which is necessary for the titration method. The burette is used to find the volume of base needed to neutralise the acidic solution. I also used electronic balance to weigh the iron nails initial mass before in undergo rusting and the final mass after the iron nails undergo rusting. Stopwatch is used to record the time taken for the acid to remove the rust stain. *Due to some error, all the pictures for the experiment have loss. 2. Methodology: 2.1 Variables and method of controlling variables Variable type:  Independent Variable:  Different type of vinegar brands Method of controlling:  By using vinegar of different brands for the experiment. Variable type:  Dependent Variable:  Volume of sodium hydroxide needed to neutralize acid solution Method of controlling:  By measured the volume of sodium hydroxide needed to neutralize acid solution using burette. Variable type:  Controlled Variable:  Volume of vinegar used Method of controlling:  Fixed the amount of vinegar is used for the experiment which is 2.0 ml. Variable:  temperature Method of controlling:  The experiment is conducted in same room Variable:  Volume of distilled water added Method of controlling:  Fixed the amount of volume distilled water added in the vinegar. Add phenolphthalein Method of controlling:  By adding 3 drops phenolphthalein to every vinegar solution in conical flask during experiment. Variable:  Concentration of sodium hydroxide Method of controlling:  By fixed the concentration of sodium hydroxide used which is 1.0 M. Table 1 : Variables for experiment to determine the percentage by mass of acetic acid in vinegars Variable type Variable Method of controlling Independent Type of vinegar used By using vinegar of different brands for the experiment. Dependent Time taken to remove the rust stain By recorded the time taken for different type of vinegars to remove the rust stain on the iron nail using stop watch. Controlled Type of metal By using the same metal throughout the experiment which is iron nail. Temperature The experiment is conducted in same room Using same electronic balance By using the same electronic balance to weigh the mass of iron nail. Time for iron to rust Fixed the time for the iron to rust which is 7 days or i week Using same stopwatch By fixed the type of stopwatch used to record the time taken. Table 2 : Variables for experiment to determine the time taken for the vinegars to remove rust 2.2 Methodology for neutralisation process To find the percentage by of acetic acid in different types of vinegar brands, a neutralisation process follow the standard procedure is carries out. First , the apparatus is set up . The burette is clamped on the retort stand. Then, 2.0 ml of vinegar is measured using measuring cylinder. An empty conical flask is weighed. Then 2.0 ml vinegar which is Earth Brand is poured in the conical flask. The conical flask is weighed again. This procedure has to be carried out to find the mass of 2.0 ml of vinegar assumed that different vinegars has different density. After that, 48.0 ml of distilled water is measured using measuring cylinder. Then, the distilled water is mixed with the vinegar in the conical flask. This procedure has to be carried out because vinegar is very concentrated so dilution process has to be done. The pH mater is used to find the pH value of vinegars. After mixed, the initial weight of vinegar with conical flask is measured using weighing balance. Then , sodium hydroxide is filled in the burette. The conical flask is placed under the burette. 3 drops of phenolphthalein is added into the diluted vinegar. The neutralisation process is started as soon the alkali is added into the conical flask. The sodium hydroxide is assumed to only react with the acetic acid presence in the vinegar. The conical flask is swirled gently. The initial colour for the acidic solution is colourless. As the acid solution undergo titration, the colour change from colourless to pale pink colour. The end of titration is indicated when the mixture remains in pale pink colour. The titration process is stopped. The volume of sodium hydroxide needed to neutralise 2.0 ml of vinegar is recorded and final weight of vinegar with conical flask is weighed. The experiment above is repeated twice to get the average reading of volume of sodium hydroxide needed to neutralise the acid solution. All the data is recorded in the table. The experiment procedure above is then repeated using different type of vinegar which is Yeos and Jalen. Burette,  ±0.05 cm3 Different vinegar brands (Jalen, Yeos, Earth Brand) Beaker,  ±0.5 Conical flask , ±0.5 Retort stand and clamp Pipette and ph meter Phenolphathalein Weighing balance ,  ±0.0001 Sodium hydroxide (1.0 molar) Rod and distilled water 2.3 Methodology for rusting process and rust stain removal This experimental procedure is carried out because it is hard to determine the degree of rusting of any random metal. Therefore, I fixed the type of metal use which is iron nails and the time left for iron to rust which is approximately 7 day (1 week) . The materials is ready and apparatus needed is set up. The initial mass of each iron nail is weighed and the data is recorded. The 5 iron nails is marked such as iron nail A, iron nail B and consecutively by using a small piece of paper attached to each nail. Then , a mineral bottle is cut to get the bottom part of mineral bottle and form a cup like. Then, the cup is filled with small amount of tap water. All iron nails is dipped in the water and left to be exposed to air in the laboratory for seven days. After seven days , all iron nails are take out from the bottle. Then, each iron nail which already rusted now is weighed again to get mass of rust with the iron nail. The mass of rust formed on each iron nail is found by subtracted the final weight of iron nail with its initial weigh. Then, the average mass of rust formed is calculated. All the data of the experiment is recorded in a table. The experiment above is repeated twice. The process to remove rust stain is carried out. Vinegar is inserted into a transparent cup. The rusted iron nail is immersed into the cup contained vinegar. The reaction is observed. The time taken for the iron rust to be remove completely by the vinegar from the iron nail is recorded by using stopwatch. The same procedure done to all 5 iron nails . The average time taken needed to remove the rust is calculated. The data and result is tabulated. The experiment above is repeated using different type of vinegars. Apparatus and materials Burette,  ±0.05 cm3 Beaker,  ±0.5 Bottle cup Different vinegar brands (Jalen, Yeos, Earth Brand) Conical flask , ±0.5 Measuring cylinder,  ±0.05 Weighing balance ,  ±0.0001 5 Iron nails Distilled water 3. Data collection and processing 3.1 Data collection and processing for experiment   Quantitative data Type of vinegar brand Weight of empty conical flask (g)  ±0.0001 Weight of 2.0 ml of vinegar with conical flask (g)  ±0.0001 Mass of vinegar  ±0.0002 (g) Earth Brand Qualitative data The initial colour of vinegar and sodium hydroxide is colourless. The colour of vinegar solution remains colourless even after phenolphthalein is added. When the mixture undergo titration process, the mixture remains colourless but when the end point of titration reach, the colour of mixture turns from colourless to pale pink. Equation for the neutralization process = CH3COOH (aq) + NaOH (aq) à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ CH3COONa (aq) + H2O (l) Calculation of percentage by mass of acetic acid in vinegars. 1. Earth Brand Calculate number of moles for NaOH = MV 1000 (32.54 ml of NaOH solution added x 1.0 molar of NaOH) 1000 = 0.03254 moles of NaOH uncertainties =( 0.05/ 32.54) x 100% = 0.15 % CH3COOH (aq) + NaOH (aq) à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ CH3COONa (aq) + H2O (l) From the equation , the acetic acid in vinegar reacts with sodium hydroxide in a 1:1 ratio. 1 mole of acetic acid reacts with 1 mole of sodium hydroxide to for 1 mole of sodium acetate and 1 mole of water. Thus, 0.03254 mole of acetic acid reacts with 0.03254 mole of sodium hydroxide to form 0.03254 mole of sodium acetate and 0.03254 mole of water. Calculate the amount of acetic acid in Earth Brand. Therefore, Molecular mass calculation: 12.0107 + 1.00794*3 + 12.0107 + 15.9994 + 15.9994 + 1.00794 = 60.05196 g/mol To find the mass of acetic acid in vinegar is given by the formula number of mole x molar mass of acetic acid Thus, 0.03254 moles x 60.05196 g/mol = 1.954 g of acetic acid  ± 0.15 % To calculate the percentage by mass of acetic acid in vinegar (Earth Brand): Mass of vinegar use= 2.2837 g uncertainties = (0.0001/2.2837) x 100% = 0.0044 % mass of acetic acid in vinegar = 1.9540 g The percentage by mass of acetic acid =(1.9540/2.2837 ) x 100 = 85.56 % uncertainties = 0.0044 + 0.15 = 0.1544 % Therefore, the percentage by mass of acetic acid in Earth Brand is = 85.56 %  ± 0.15 % The method of calculation of percentage by mass of acetic acid for other vinegars is same with the calculation above. Therefore, the result for the calculation is tabulated. Discussion The 2.0 volume for vinegar used needed to be weighed to find the mass of vinegar as I assumed the density for vinegar is different from density of water. From the result, it shows that different vinegars has different density, therefore different vinegars will have different mass of 2.00 volume used. I also assumed that during neutralisation process, the sodium hydroxide will only reacts with the acetic acid presence in the vinegar. Based on the result , it shows that different type of vinegar brands has different percentage by mass of acetic acid of vinegar of different brands. Jalen has the highest percentage by mass of acetic acid followed by Earth Brand and Yeos. These explained that why different vinegars have different ph value. Acetic acid is weak acid. The higher the percentage by mass of acetic acid, the lower the pH value of the vinegar. Hypothesis for experiment one is accepted. Different type of vinegar has different percentage of acetic acid of vinegar. Thus, experiment two can be conducted. 3.2 Data collection and processing for experiment 2 Quantitative data The iron nail pale brown in colour while the tap water and the vinegar is colourless. When the iron nail is left in the bottle cup, there is no immediate reaction occured. After several hours, a reddish brown substance start to appear around the iron nail. After several days more reddish brown substance deposited around the iron nail like coated it. When the iron is immersed in vinegar inside a cup bottle, bubble formed and the reddish brown substance fall off from the iron nail. The colour of vinegar turned slightly from colourless to pale reddish and the reddish substances settle at the bottom of the cup bottle. Later, it dissolve in the vinegar. 4. Processed result Discussion To put in a simple words, rusting is the corrosion of iron and readily occurs in the metal in the presence of water , oxygen and iron. The formation of a reddish brown substance like which appeared and adheres to the iron nail is called rust. Based on the research, it shows that vinegar could serve as one of the substance that can remove rust stain on metal due to the presence of acid. From the experiment , It clearly shows that different vinegar has different degree of removing the rust stain because due to different percentage by mass of acetic acid in the different type of vinegars. After rusting process occurs on the iron nail, the iron nail weighed more. These is because rust  forms when iron metal is oxidized by oxygen in the presence of water . Iron oxide is another term for rust. Iron oxide as a molecule and consist of three elements which is of iron with oxygen and water. From the result obtained based on the experiment, it shows that the rust form is originally mass from the iron but the mass of oxygen and water comes from the atmosphere. When the rust form on the iron nail, the mass of iron rust increased by the mass of oxygen and water that combined with the iron. Therefore, iron nail weight more after rusting process occurs due to addition of these elements from atmosphere. In the presence of oxygen and water, Reduction half equation: 4e- + 2H2O(l) + O2(g) > 4OH-(aq) The tip or the head component of iron nail is easily oxidised. The crystal lattice of iron is distorted and the iron atoms will be facilely oxidised. Oxidation half equation: 2Fe(s) > 2Fe2+(aq) + 4e- Therefore the overall net equation for the chemical reaction is 2Fe(s) + 2H2O(l) + O2(g) > 2Fe2+(aq) + 4OH-(aq) The process continue. After that, the Fe2+ and OH- ions will move and diffuse through the water. When both ions meet they will react to produce precipitate which iron (II) hydroxide , Fe(OH)2 .These iron (II) hydroxide then will be further oxidise to iron (II) hydroxide, Fe(OH)3 and will be dehydrated to produce rust. Chemical equation for rusting process : 2Fe(s) + 2H2O(l) + O2(g) > 2Fe2+(aq) + 4OH-(aq) Fe2+(aq) + 2OH-(aq) > Fe(OH)2(s) Fe(OH)2(s) + O2 > Fe(OH)3(s) Fe(OH)3(s) dehydrates > Fe2O3.nH2O(s) or rust Therefore, the chemical formula for rust is Fe2O3.nH2O(s) [5] (Loh Wai Leng,Tan Yin Toon,Tan On Tin, 2011, oxidation and reduction) Acetic acid is a weak acid that presence in vinegar. Vinegar works well than other strong acid because the presence of weak acid. Therefore, it will less attack the iron nail itself. Strong acid will corrode both the rust stain and the iron nail. To prevent that, substance with weak acid is preferable. When the iron nail with rust is soaked into the vinegar containing acid, the rust on iron nail will dissolve and loosen. The crumbly hydrated iron oxide will form a soluble salt, in these reaction between acetic acid and iron(III) oxide, it will formed iron acetate. Equation of reaction between acetic acid and rust: 6CH3COOH(l) + Fe2O3 (s) > 2Fe(CH3COO)3 (s) + 3H2O (l) and ferric acetate, Fe(CH3COO)3 is water soluble. However, the hypothesis for my second experiment is rejected. Clearly from the experiment above, it shows there is no directly proportional relationship between percentage of mass of acetic acid in vinegar and rate of removing rust. Jalen has the highest percentage of mass of acetic acid followed by Earth Brand and Yeos but Earth Brand shows the highest rate of removing rust followed by Jalen and Yeos. There, my experiment has limitation which lead to these result. After the experiment, I accidentally left the iron nail that already washed with vinegar in the cup bottle. I found out that the rusting on iron nail occur more faster by the day. I concluded myself that acid actually can remove the rust stain from the nail but in the same time it also promote rusting. The surface of iron nail will clean after the rust stain is remove and let the iron nail exposed to acid. Somehow, acid will react on the surface of iron nail. Further research could be done to investigate the after effect of acid after removing the rust stain. 5. Conclusion This research show that each vinegar has it own percentage by mass of acetic acid in each and every different type of vinegar. From the experiment and calculation, it shows that the percentage by mass of acetic acid in vinegar brands of Earth Brand, yeos and Jalen accordingly is 85.56%, 83.68% and 92.20%. The difference of percentage by mass of acetic acid in vinegar resulted the difference in the vinegar taste and the pH value. The experiment shows that there is not much significant difference of percentage by mass of acetic acid in different type of vinegar brands. The vinegars used in the experiment is the product of Malaysia . Different result may show if I test of the products of other country. These difference of percentage of acetic acid in different type of vinegar, effect the result obtained in experiment two. The hypothesis for experiment one is accepted. These research also shows that vinegar could serve as a potentially rust stain remover but in low degree because acetic acid presence in vinegar is a weak acid. Still, it could be use safely because the acidic concentration is not harmful and vinegar is easy to obtain rather than any other applications. However , from the result obtain, it shows that the higher the percentage of acetic acid in vinegar, does not always cause higher rate of rust stain removal. Jalen has the highest percentage by mass of acetic acid in vinegar followed by Earth Brand and Yeos which is 92.20%, 85.56% and 83.68% respectively. But the experiment shows that the vinegar that has the highest degree of rust stain removal is Earth Brand followed by Jalen and Yeos which is 0.0049gs-1, 0.0044gs-1 and 0.0043gs-1 second respectively. Therefore I could conclude that , Earth Brand is a better rust stain remover Yeos and Jalen , but Jalen is better than yeos. Even though there is no not much significant difference, but it effected the overall result. Therefore, the hypothesis for the second experiment is not accepted. There is several reason why these result obtained. Maybe there is another substance that presence in the vinegar, react with the rust stain on iron nail which can affect the result because I assumed that the rust stain will only react with the acetic acid presence in vinegar. Further research could be conducted to explain and determine the problem. The other reason may cause due to limitation that will be discuss later. However ,these research able to prove that there is difference of percentage by mass of acetic acid in different type of vinegar and vinegar can act as a potentially rust stain remover . But due to weak acid presence in vinegar, vinegar could only remove rust stain that only form only on surface of metal . It cannot remove the rust that has been deeper into metal . Overall, I can conclude from the experiment that different vinegar has different percentage by mass of acetic acid and vinegar is a highly potential rust stain remover. 6. Evaluation Throughout the experiment there are several limitations that can affect the result of the experiment. During the titration process, The colour of acidic solution which is vinegar, will change from colourless to pale pink at the end of titration process. The perception of colour change will affect the result. It is hard to determine what the exact pale pink colour that need to be achieve. In order to overcome this problem, a controlled conical flask containing acid solution when end point of titration which colour is pale pink should be put beside the set up apparatus so that the person would know what exactly pale pink colour they need to reach. pH meter also can be used to fixed the pH value needed. Another problem that could effect the result is when weighing the weight of iron nail after the rust is formed. Rust that is formed for several days only appear on the surface of the iron nail. Therefore, when removing the iron nail to be weighed, the rust from the surface of iron nail could drop. Even a slight drop of rust from the iron nail, could cause the result obtained will not be accurate . Therefore, to overcome these problem, during the formation of rust, the iron nails should be left on the electronic balance. So, the iron nail does not have to be removed and rust will not fall off. The result obtained will be more precise. Another problem that could arise is when removing the rust from iron nail using vinegar. In these experiment, I assumed that, only acetic acid in vinegar will react with the rust on the iron nail. So that my hypothesis could be achieved. But it turn out my hypothesis is invalid. It could be that other substances presence in the vinegar, will react with the rust on the iron nail. After all, vinegar consist more than one substance. these problem can be overcome by doing some further research. Lastly, the after effect of the experiment. Acid can remove rust stain but the chemical reaction between acid and the surface of iron nail, can increase the rate of rusting of iron nail. Corrosion in acid solutions is much more rapid than in neutral solutions, and the latter is more rapid than in alkaline solutions.[6](Frank N. Neller,2004, Corrosion Facts). Therefore to solve the problem, after washed the iron nail to remove the rust, the iron nail need to place in boil water for a while. Therefore, no after chemical reaction will occur. Thus, rusting will not occur.

Essay --

Discussion In nature, there are a group of proteins which are known to produce a universal response that is the production of stress proteins namely heat shock proteins (Hsp70), expressed in response to external stimuli. They are expressed in normal state conditions hence aiding in the native polypeptides folding and its translocation to different cellular compartments (Feder and Hofmann, 1999; Hartl and Hartl-Meyer, 2002). Iwama et al. (2004) worked on whether Hsp70 are a molecular marker for indicating stressed states in fishes. Ammonia which is a common pollutant has been seen and known to interfere with cellular proteins and in turn interfere with amino acid homeostasis (Cooper and Plum, 1987). As a result of ammonia toxicity, Hsp70 protein gets enhanced and in turn helps in inducing proteotoxicity. Our observation proves that the ability of these fishes (M. cuchia) to tolerate such high concentration of NH4Cl is mainly due to the ability of Hsp70 to induce proteotoxicity, an ability to rep air partly denatured proteins caused due to ammonia toxicity. Similar observation of expression of Hsp70 was seen in brown trout (Salmo trutta f. fario) exposed to sub-lethal concentrations of ammonia (Luckenbach et al., 2003). Immunocytochemical analysis clearly demonstrated the localized expression of Hsp70 in liver, kidney and brain of M. cuchia during exposure to 50 mM NH4Cl for 7 days with a slight fall of expression in 14 days 50 mM NH4Cl tissues (Fig. X). Immunopositivity to Hsp70 antibody has been detected in control as well as in 7 and 14 days 50mM NH4Cl treated tissues. In the unstressed cells Hsp70 helps in maintaining cellular homeostasis (Fink and Goto, 1998). In liver, the expression of Hsp70 was more predominant in hepatic sin... ...l red skeletal muscle of paddleï ¬ sh. To add to our observation, Poltronieri et al. (2008) also found Hsp70 immunonegativity in control tissues of carp (Cyprinus carpio) and rainbow trout (Oncorhynchus mykiss) along with absence of immunopositivity in stressed states. The fall in immunoreactivity which was observed in 14 days of NH4Cl treated tissue might be mainly due to slight acclimatization at the end. Therefore, one needs to find out the possible implications of Hsp70 in this fish, M. cuchia, which is known to tolerate high ammonia concentrations. As Hsp70 is known to act as an important candidate for identification of stresses and also an important biomolecules acting as sentinels of contamination exposure, this stress proteins, Hsp70 might give a better understanding of how these fishes adapt themselves to such concentrations of environmental ammonia toxicity.

Personal Narrative- Life as a Journey Essay example -- Personal Narrat

Personal Narrative- Life as a Journey The journey of life follows a predetermined pattern; we evolve from needing influence and guidance to finally reaching that point where our lives are up to us. I consider myself very lucky up to this point in my journey. Some people become sidetracked and wind up on a far different course than initially planned, but the detours I made have only assisted in embellishing the individual instead of devouring it. According to Freud a person's most important period to grow personality ranges from birth to six years. In that span my biggest influences came from my family. When I think of that time before kindergarten, the single most important person to my development was my grandmother Carmen. She didn't graduate from college or sell wheat futures in the stock market, but she had wisdom and tenderness so few possess. My parents worked, so each morning my mother would drop me off at Grandma's house. I didn't realize it then but in retrospect, this woman has led a remarkable. She birthed three sons all by Caesarian section, lost a husband in middle age, and then all but raised a grandson for half a decade. She taught me how to walk and gave me my first piano lessons. She remains close to all her grandchildren yet her and I both know she holds a special place for the first one. When I began school, friends began to shape path for this journey. In the beginning we hardly know these classmates. Common interests and experiences bond or repel certain people to others. I didn't understand what friendship meant until August 16, 1997 though. That morning, I fell asleep at the wheel of my car and ran into two utility poles and a tree while going 40 miles per hour. An ambulance rushed me to Memorial... ...will become the ultimate test between temptation and my inner-strength and the morals I have placed for my own behavior. Possibly the biggest choice of any person's life remains what vocation to go into. Even areas people have skills in may not give enough satisfaction to turn into a career, whether that satisfaction stays financial or otherwise. Whatever occupation I choose, I sincerely hope that the trek will remain on its uncertain and awesome course. Throughout this journey of life many outside forces manipulate whom all of us become. Who created my personal connotation? Through every relative, friend, and composition it boils down to me. I have taken all these beliefs and crammed them into a 6 feet, 2 inch frame. The real journey lays ahead, the journey from young adulthood to old age. I only pray this journey includes many travels and few destinations.

We Must Strive to Protect Privacy in Technology Essay -- Argumentative

We Must Strive to Protect Privacy in Technology Technology is getting more and more complex as the years come and go. The availability of personal information is easier to access and the risk of it being tampered with is also high. As the years pass, the threat of privacy invasion gets greater and greater and easier to happen. There are several ways that privacy is able to be invaded and there will only be more to come. Americans have had their personal information given away without even knowing it. From dozens of public and private sources that have created consumer profiles, â€Å"the average American is profiled in up to 150 commercial databases† (Hinds 7). People are trying to â€Å"prohibit collection of personal information on the internet without consumer authorization† (Hinds 9). This is a very difficult thing to have happen, but it is a goal of several people who feel the same way. The amount of technology that is able to raid privacy is growing. â€Å"Every day millions of ordinary people are subject to a variety of technologies that invade their privacy† (Regan 1). Even in ...

Implementation Plan Essay

How ethical are you? Do you consider cheating on your taxes ethical? Are your ethics situational? Are you demonstrating ethics by deciding to do the right or the thing that will make you acceptable to the group or your subordinates? Unethical behavior is thriving well in our country. There are business executives with their perceptions of ethical leadership and its development researched by Catherine Marsh, in our work place there are leaders who are attempting to eliminate bullying through the examination of The Role of Ethical Leadership and its Effects on the Work Environment. The authors who researched information on bullying in the work environment were, Stouten, J. Baillien, E, Van den Broeck, A, Camps, J. De Witte, H. and Euwema, M. in 2011. Thirdly, we have authors; Michele K. Kacmar, Daniel G. Bachrach, Kenneth J. Harris, and Suzanne Zivnuska through their research tested the relationship between ethical leaders in regards to gender in the article Fostering good citizenship through ethical leadership: Exploring the moderating role of gender and organizational politics. Comparatively, the three articles similarity is the examination of ethics within the roles of leadership. Their examinations are inclusive of ethics in the work environment, business executives and their perception of ethical leadership and fostering good citizenship among the genders and organizational politics. Article one is qualitative researched based, article two is qualitative in regard to the workload and quantitative in regards to poor working conditions and article three, mixed-method of research. Research Question(s) The questions posed by the authors were for those that consider themselves ethical leaders what aspects did the value, how does one experiences determine how ethical a leader they are/ Are there significant strategies that ethical leaders could use to eliminate and /discourage bullying? How does the role of gender foster good citizenship through ethical leadership? (Marsh, 2013) The limitations of the studies were similar in their restrictive sampling of data. The participant in article was selected based on recommendations. The author stated that business leaders in which was believed to be ethical were contacted. This study gave the business executives an opportunity to share their personal stories and come to a clear understanding of their ethical leadership skills. Authors’ findings provided evidence that leaders can be an example to followers and model ethical behavior so that workers will be less inclined to be a target of bullying. An understanding was gained by the sample used of supervisors and employees working together daily. In conclusion the three articles examined leadership ethics using different variables. Article one was a qualitative study that examined the perception of how ethical leaders perceived themselves. Each executive shared personal stories from the personal experiences that designed the ethical framework. Article two examined bullying and the impact of ethical leadership and the ability of ethical leaders to curtail or eliminate bullying in the workplace. Article three examined the gender and political organization and how good citizenship could be fostered through ethical leadership.

Rabindranath Tagore Selected short stories Essay

Profit and Loss This narrative briefly describes the short, sorrowful life of Nirupama. The name signifies ‘peerless one’ and was given to her by her parents, who were gratified with a daughter after having had five sons. Being treasured, her father searched long and hard to find a groom he deemed suitable enough for her. He engaged Nirupama to the son of a â€Å"grand† Raybahadur who asked for a dowry of 10,000 rupees. Even though he had no way of paying the large sum he found such a chance hard to refuse and he procured a way to borrow the money. However once this fell through the prospective husband, despite the wishes of his parents, still insisted on marrying. Once married, the bride’s father, Ramsundar Mitra had to beg to visit his daughter. She was treated spitefully and Ramsundar heard of the contempt and shame that his daughter was suffering and so attempted to sell the house, without the knowledge of his other children. Unluckily these found out and protested, ha lting his plans. Later she asked to come home for a few days, so he gathered a portion of the owed amount, yet the in-laws denied his request. At last he made up his mind to not return until he was in possession of the full sum. Finally he managed this, foregoing the wishes and needs of the rest of his household, however his daughter discovered this and forbade him to pay another single paisa, otherwise she warned that he would never see her again. Her sacrifice infuriated her new family even more, and she became more like a servant of the household, than a member of the family. She no longer cared, neglected her well-being and became seriously ill. Her in-laws refused to believe her illness was legitimate and only pitied her enough to call the doctor the night she died. Unlike their treatment of her while she was alive, her funeral pyre was said to be magnificent. Soon after, the family found a new wife for their son, the dowry this time was 20,000 â€Å"cash down†. Little Master’s Return Little Master’s Return tells of the life of a servant, Raicharan whose life is formed through his duties. He brings up his rich employer’s son, Anukul and in turn his son. During the monsoon season the little boy is insistent to go out for a walk one day, tempted by the gurgling water, he drowns. The dedicated servant is devastated and when the mistress, the mother to the boy suggests that it is perhaps he who stole him for the sake of the gold he was wearing, he leaves out of shame. Returning home, his old wife gave birth to a son. His wife died, and due to his contempt towards the boy, his sister looked after him and called him Phelna. Over time Raicharan convinced himself that this was in fact the little boy returning, ‘little master cannot do without my love: he has been born again in my house’. This conclusion came from several proofs: firstly the interval between the death and birth was short, his wife was thought to be beyond a child-bearing age and the child seemed to crawl, toddle and call his aunt ‘Pishi’ just as his little master had done. With this belief he no longer hated the child, but reared the child like that of a high born, not allowing him to play with the village children and even selling all his possessions in order to enable the child to go to a school for the high class in Calcutta. His fatherly affection to his son was un-doubtable but his devotion was more that of a servant. His son never even told his friends that this was his father and made fun of him behind his back. Due to his age Raicharan resigned his job in the city he had taken to pay for the school and went back to the village, to his old employers. He admitted that it was him who stole their child, but that he was to return in two days. The day came and the family was convinced that the boy, brought up in a manner similar to their own, was theirs. After all, how could have Raicharan have acquired such a boy? Why would the old servant mislead them now? Raicharan described the birth of the boy as ‘fate’, Anukul became angry at Raicharan blaming God yet Phelna asked for his pardon. Raicharan was now to receive a monthly allowance, but when sent to his village the money returned, no one had heard of Raicharan. Wealth Surrendered The story tells of Yajnanath, who although wealthy, lived like the old sages; on impossibly little. His son, Brindaban Kunda, bore with his father’s choice of living until he married. The frequent rows became worse when his wife, who had been seriously ill, died. Brindaban blamed his father for her death as he had refused to pay for expensive medicines as he believed that like before, one should not try to ‘cheat’ death. With this Brindaban left taking with him his four-year-old son. Yajnanath greatly missed his troublesome grandson and when one day a particularly plucky boy was pestering him, he decided to adopt him. Yajnanath spoiled the young Nitai Pal and when a passerby mentioned that a Damodar Pal was looking for his son, he resolved to hide him. During the dead of night the old man took Nitai to the outskirts of the village to an abandoned temple. Lifting up a stone slab he leads him down to a secret cellar in which Yajnanath had hidden all his wealth. He worshipped Nitai in order to leave him his inheritance and left the boy safely hidden. Around dawn he found his own son, Brindaban who, in his shame for his father had changed his name to Damodar. Alarmed the old man collapsed asking, â€Å"If you strain your ears, can’t you hear someone crying â€Å"Father†?† Damodar could not. From then on when Yajnanath asked â€Å"Can you hear the crying?† everyone laughed at his madman’s words. Four years later he died. Skeleton What could have been a tragic love story starts with the account of three young boys studying anatomy from a skeleton. Years later one of the children, now older, is forced to sleep in the room that previously housed the carcass due to guests in the house. In his sleepless desperation he imagines to be able to feel a presence. Knowing that the footsteps he thinks he can hear are simply a fabrication, he calls out. Unexpectedly he receives a reply. The voice belongs to the owner of the skeleton, and is now looking for it. The ‘presence’ lonely and missing human company requests to tell him the story of her life. She starts by briefly describing her short unhappy marriage in which her husband died after two months. Brought back to her father’s house she embarks upon a long tale of her rare beauty and how she was aware of its influence. She even appeared to influence her brothers only friend, a young doctor, who when she was sick would feel her pulse and she would imagine his to equally race. Growing obsessed she fantasized only about him. Not only did she love this young doctor, whose name was Shashishekhar, but she worshipped him and became enraptured. However she soon found he was to be married and benefit a sum of 12,000 rupees. Feeling hurt and betrayed she confronted him and insisted on throwing a grand ceremony. On the night of the wedding she poisoned his drink and dressing her finest in a Benares sari, all the ornaments from her jewellery chest and vermillion in her hair (in order to symbolize that she was married) lay down to die under her favourite bakul tree (the one she used to daydream under) and died. She woke up to find the three young boys playing with her skeleton. And when finally he spoke in the rising dawn, there was no answer. Housewife Housewife is a account of how one’s experiences when young can deeply impact you for a long times. Shibanath, who was clean-shaven, with closely cropped hair except for a short pigtail is a teacher. He terrifies his pupils and is described as a ‘man-god’. Shibanath would give each of his student’s new names. The author’s theory is that ‘people generally love their names more than their own selves’. This is the story of how Ashu, a studious, good-natured boy in his class, acquired his name. Precisely at one each day a servant-girl would bring him a few sweets wrapped up in a leaf, and a little bell-metal pot of water, a daily occurrence which he found extremely embarassing. On a holiday the kind Ashu was playing with his sister who had no other play companions. On this particular day it was the wedding of her doll, however she found no one to be the priest. She asked a passerby, through unfortunate luck this was Shibanath, who was sheltering from the rain under the porch. Alarmed Ashu raced inside, utterly embarrassed. The next day this incident was described to the entire class, so when at exactly one the servant-girl came Ashu usual gentle smile gave way to a deep blush. The veins in his forehead began to throb and he broke down into a flood of tears. He was mocked mercilessly, ‘Housewife, housewife!’ From this he gathered that playing with one’s sister on a holiday was the most shameful thing in the world and no one would ever forget it. The Divide The Divide is a narrative of how a friendship ends between two distantly related cousins. Despite their distant blood connection and difference of ages Banamali and Himangshumali lived next door to each other. Banamali being older, he doted on Himangshumali, pouring all his love and affection on the younger boy. As Himangshumali grew he became interested in reading anything which came his way, through this he acquired his knowledge. Everyday Banamali would sit smoking his hookah on the little garden patio, waiting for Himangshumali to come home from school. As soon and the younger boy had washed and changed they would stroll in the garden together talking. They both loved gardening, Banamali with his heart, Himangshumali with his intelligence. When it became dark Himangshumali talked about the things he read, he thought and what came into his imagination; some correct, some not. Banamali would listen solemnly adding his own thoughts and listening to Himangshumali’s objections, pondering what was said the previous night quietly while he smoked. As it happened the gardens of these two neighbours were simply separated by a ditch, within which grew a lime tree. When the fruit grew and was ripe for harvesting the servants of the two households had a quarrel over whose tree it was. Eventually the fathers of each of friends got involved; this grew into a fully fledged argument between the two. Lawyers and barristers were hired to legally dispute the case. Overall more money was spent than the floods that ran through the ditch and in the end it was Banamali’s father that won. Throughout the court-case the two neighbours sons had managed to remain friends, however once this battle was over Himangshumali no longer came. When Banamali asked at his house, his father responded that no one was home. For a week Banamali waited, and no one came. Taraprasanna’s Fame A highly intelligent and intellectual writer, Taraprasanna spent his time at home writing with weakening eye’s and a bent back. Although thought to be talented, he was shy and socially awkward. He did not understand usual social interactions and would instead stare and wonder. Unlike his wife, the writer was never eager to publish his work, however when the oldest of his four daughters was old enough to soon be seeking a groom, he grew worried and fretful. How was he to raise enough money to marry off four daughters? As a fervent admirer of his work although she did not understand a word, his wife urged him to go to Calcutta in order to publish his work. As she could not go herself, he was accompanied by a ‘worldly-wise man’ from the village in order to assist him due to his peculiar behaviour and remind him of his chores. While there, Taraprasanna published his book, The Radiance of Vedanta and sent it to every editor for review. He also personally sent one to his wife by registered mail, in the fear of it getting lost. She was so overjoyed that Dakshayani invited all the women she knew in the village round for a meal. Taraprasanna even sent one to all the libraries requesting one, as many wrote ‘your thoughtful book has met a great need in our country’, from his own expenses. He even received a joyful letter from his wife, telling him she was once again with child. However he found that as many copies he had sent out, he had sold not a single copy, so finally at a loss he returned home. He brought back with him all the reviews of his book, however his wife as pleased as she was, was eager to see how successful he had been in terms of money. He only returned with five rupees. Dakshayani was heart-broken; all her faith in the honesty of the world had been destroyed. It was around this time that Dakshayani’s health worsened as her confinement approached, the village worried recognised her need for a midwife. So Taraprasanna, desperate approached his friend Bishvambhar, who at his own expense travelled to Calcutta in search of one. As the birth was drawing nearer his wife impelled him to promise and vow on several matters , she also requested that her daughter be called, Vendantaprabha, â€Å"The Radiance of Vedanta†. She thought, ‘ I came into his house to give him nothing but daughters. Perhaps his misfortunes will end now.’ As the midwife exclaimed at the newborn girl, Dakshayani whispered her daughter’s name one last time before dying.