Melanie McGivern. Access to nursing Group 2 Effects of pH on enzyme activity Contents Front cover Aim Introduction Hypothesis Prediction Variables Materials Methods Results Discussion Conclusion Bibliography Aim The aim of the experiment is to see the enzyme amylase catalyse starch in a chemical reaction. | | Introduction Enzymes are proteins. They act as catalysts‚ allowing chemical reactions to take
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eLearning 2009 Publication No. 91860 Rate of Reaction of Sodium Thiosulfate and Hydrochloric Acid Rate Laws Introduction The purpose of this demonstration is to investigate the effect of sodium thiosulfate concentration on the rate of reaction of sodium thiosulfate with hydrochloric acid. The reaction‚ which produces solid sulfur‚ will be followed by measuring the time needed for the reaction mixture to become opaque. The results will be analyzed graphically to determine the order of
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Chapter 28: Nitration of Methyl Benzoate I. General Information: A.) Microscale Nitration of Methyl Benzoate B.) C.) May 17‚ 2008 D.) Reaction(s)‚ including molar masses and all relevant physical data E.) Mechanism for the nitration of chlorobenzene: II. Purpose: In this experiment we are to take a cold solution of an aromatic ester that is first dissolved in sulfuric acid and is then reacted with nitric acid. This is a highly exothermic reaction and is kept under control by means
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Moore 1 Moore Mr.--------- English 1101 20 June 2013 The Obvious Effects of Fast Food Morgan Spurlock felt a need to raise awareness on obesity and the effects of fast food. In his film Supersize Me‚ he ate only food from McDonald ’s three times a day every day for a month. He consumed nearly twice the recommended amount of calories per day. Throughout the experiment‚ he experienced transient depression‚ sexual dysfunction‚ and in one instance a series of heart palpitations. At the end of
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Na2Cr2O7? Explain. Orange. 3. Explain why hexane will dissolve benzene but will not dissolve sodium chloride. Sodium chloride is an ionic compound. 4. Some drinks like tea are consumed hot or cold‚ whereas others like Coca-Cola are consumed only cold. Why? For taste reasons‚ these drinks can be drunk if the user likes It but having coca cola like tea would be gross. 5. What is the effect of: a) pressure on solubility of gases in liquids? pressure forces more gas into a liquid
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Making Sodium Chloride Equipment: Method: 1. Firstly‚ safety measures were taken by putting on laboratory coats‚ wearing safety goggles and tying long hair back. This was to protect clothing‚ eyes and to avoid burning as the experiment included dealing with open flames. 2. The equipment needed (as shown and labelled in picture A) was collected. 3. Using a measuring cylinder for each‚ to be exact with measurements‚ we measured out 10cm³ of HCl and 10cm³
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Ph Lab Report Bryon Kim 123013 B(2) Biology Background information/Research PH paper (litmus paper) determines how acidic or how basic a substance is. The paper changes color accordingly to color code on the pH scale. The pH scale starts from 0 to 14. The lower the number the more acidic it is. Zero is the most acidic‚ and 14 is the most basic while 7 is the neutral number for example water. Examples of an acid is lemon juice or multi purpose cleaner. Examples of a basic substance is shampoo or liquid soap
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12-STANDARDIZATION OF SODIUM HYDROXIDE Standard solutions for titrations are especially pure mixtures with exactly known concentrations. Primary standards are very pure solids. They have the advantage that they can be weighed (the analytical balance is normally the most accurate instrument in the laboratory) and they are stable under laboratory conditions. In this experiment‚ the primary standard is oxalic acid dihydrate‚ H2C2O4 ( 2H2O. It will be used to standardize a solution of sodium hydroxide
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concept and meaning of pH 2. Provide the student experience in measuring pH a. pH testing paper 3. Test the student’s hypothesis as it related to the pH of common solutions Hypothesis The pH of the tested solutions will be in the order of the following according to a pH scale: 1. Lime juice 2. Orange juice 3. Soda 4. Iced Tea 5. Milk 6. Water 7. Soapy water Material Required To facilitate this laboratory exercise‚ the experimenter needs the following: pH strips Sample reservoirs
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Prior to begin the experiment‚ preparation for some solutions is required to enhance the lab performance. The solutions needed are standardized potassium bromate‚ standardized sodium thiosulfate‚ and starch indicator. First‚ to prepare a starch indicator‚ pulverize 1g of soluble starch and add 15mL of water to make it as a paste-like substance. Dilute it with about 500mL of boiling water‚ and continue to heat until the mixture becomes clear. Cool it to room temperature and save it into a stoppered
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