balanced chemical equation for the complete combustion of ethanol. 2003:22(a) 1 8 25.0 mL of 0.12 mol L−1 standard barium hydroxide solution was titrated with nitric acid. The results are recorded in the table. Titration Volume of nitric acid used (mL) 1 20.4 2 18.1 3 18.2 4 18.1 (a) Write a balanced chemical equation for the reaction of barium hydroxide with nitric acid. 2003:23(a) 1 9 The structures of two commercially significant monomers are shown. (a) Identify
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CALORIMETRY Abstract: During the experiment‚ the group were able to perform the following objectives; to compute the heat capacity of a Styrofoam-cup calorimeter‚ and also to compute the heat of neutralization of 1.0 M hydrochloric acid and 1.0 M sodium hydroxide‚ the heat of dilution of concentrated sulfuric acid‚ and the heat of solution of solid ammonium chloride The sixth experiment was named "Calorimetry" wherein it is the measurement of how much heat is gained or released by a system as a chemical
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fraction near the junction of the two layers was discarded.) 4. 10.0cm3 of the aqueous layer was pipetted into a conical flask and was titrated with 0.1 M sodium hydroxide solution using phenolphthalein. 5. Using another pipette‚ 10.0 cm3 of the alcohol layer was delivered into a conical flask and was titrated with 0.1 M sodium hydroxide solution. 6. Steps (2) to (5) was repeated with another separating funnel using the following volume: 25cm3 of aqueous ethanoic acid and 15cm3 of
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and group 17[VIIA]. With special reference to valency electrons and ion formaton and examples. 3. How does hydrogen occur in the free and combined state? 4. Which metals react with cold‚steam and boiling water to form their respected oxides and hydroxides ? Give examples and balanced equations for each.Explain each in detail. 5. Name the methods of preparation of hydrogen by various ways. 6. Give balanced equations for the preparation of hydrogen with any three acids‚alkalis 7. Why is nitric acid
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task‚ five subgoals had to be achieved first. To find the solubility of the fats‚ oils‚ soaps‚ and detergents‚ each of them were placed into different solvents to see if they dissolved. None of the oils and fats were soluble in water (H2O)‚ sodium hydroxide (NaOH)‚ or hydrochloric acid (HCl)‚ but they were soluble in toluene and partly soluble in acetone. Testing the soaps and detergents for their solubility in water is the most important solubility test because they should form a lather that allows
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prepare a standard solution of oxalic acid and use it to standardize an unknown sodium hydroxide solution. Purpose 13C: 1. To titrate a hydrochloric acid solution of “unknown” concentration with standardized 0.5M sodium hydroxide. 2. To titrate a hydrochloric acid solution of “known” concentration with standardized 0.5M sodium hydroxide. 3. To titrate an acetic acid solution (vinegar) with standardized 0.5M sodium hydroxide. 4. To utilize the titration results to calculate the molarity of the hydrochloric
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aerobic respiration in plants and animals e.g. germinating seeds and mealworms Bio Experiment : Comparing Rate of respiration in mealworms at different temperatures? Mealworms are cold-blooded animals and are unable to maintain a constant core temperature‚ hence respiration would therefore change with temperature. As glucose is oxidised‚ oxygen is used up and carbon dioxide and heat energy is produced. Increment in temperature / production of CO2 or O2 consumption would hence be good indicators
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Also known as "benzoate of soda‚" sodium benzoate is an FDA-approved‚ polyunsaturated fat that has been used by food manufacturers for over 80 years to inhibit microbial growth. As a food additive it is used as a preservative‚ effectively killing most yeasts‚ bacteria and fungi. Sodium benzoate is effective only in acidic conditions (pH < 3.6) making its use most prevalent in foods such as preserves‚ salad dressings (vinegar)‚ carbonated drinks (carbonic acid)‚ jams (citric acid)‚ fruit juices (citric
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Section A (Answer ALL questions in this Section.) 1. Rubidium (Rb) and potassium belong to the same group in the Periodic Table. The relative atomic mass of rubidium is larger than that of potassium. (a) Explain whether rubidium is more reactive than potassium. (b) Write a chemical equation for the reaction between rubidium and water. (State symbols should be given.) (c) Suggest how rubidium can be stored safely in the laboratory. (d) Suggest ONE safety precaution for handling
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For this reason‚ it is very likely to be the percentage of acetylsalicylic acid (ASA) affecting the efficiency of aspirin‚ and this could be proved through simple neutralization reaction by titration with basic solution‚ such as sodium hydroxide. The more sodium hydroxide needed in the titration‚ the more the amount of ASA in aspirin‚ thus the more powerful the aspirin is. The equation would be: C6H5OCOCH3COOH+NaOH → C6H5OCOCH3COONa++ H2O As the percentage purity of the aspirin is calculated
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