11.7. Carboxylic acids
A subsection of Chemistry, 0620, through 11. Organic chemistry
Listing 10 of 101 questions
The following compounds are present in a liquid used for cleaning metal. ethanoic acid ethanol glycerol sodium chloride water Draw the structure of the functional group present in ethanoic acid. Which one of the following pH values is acidic? Put a circle around the correct answer. pH 4 pH 7 pH 9 pH 13 Ethanoic acid reacts with sodium hydroxide. What type of reaction is this? Put a circle around the correct answer. neutralisation oxidation polymerisation reduction The reaction of ethanoic acid with sodium hydroxide is exothermic. What is meant by the term exothermic? The structure of glycerol is shown. H C H C H C O O O H H H H H Deduce the molecular formula of glycerol showing the number of carbon, hydrogen and oxygen atoms. Balance the chemical equation for the incomplete combustion of ethanol. C2H5OH + 2O2 CO + H2O Describe a method of obtaining pure samples of both sodium chloride and water from aqueous sodium chloride. Explain why this method works. Which physical property could you measure to find out if a sample of water is pure? Sodium chloride contains chloride ions. Describe a test for chloride ions. test result
0620_w17_qp_32
THEORY
2017
Paper 3, Variant 2
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Ethanol, C2H5OH, can be made by fermentation. Complete the chemical equation for the formation of ethanol by fermentation. C6H12O6 C2H5OH + State two conditions required for fermentation. Ethanol can also be made by the catalytic hydration of ethene. The equation for the reaction is shown. C2H4 + H2O C2H5OH Name a suitable catalyst for this reaction. Calculate the maximum mass of ethanol that can be made from 56 g of ethene. maximum mass of ethanol = g Ethanol can be oxidised to form ethanoic acid. Name a suitable oxidising agent for this reaction. A molecule of ethanoic acid has the structure shown. C C O O H H H H Complete the dot-and-cross diagram to show the electron arrangement in ethanoicacid. Show outer shell electrons only. H C H C O O H H Ethanoic acid is a weak acid. When referring to an acid, what is meant by the term weak? Describe how you could show that ethanoic acid is a weaker acid than hydrochloric acid. Carboxylic acids react with alcohols to make esters. The structure of an ester is shown. C C O O C H H H H H C C C H H H H H H H C H H Draw the structures of the carboxylic acid and alcohol from which this ester can be made. Give the names of the carboxylic acid and alcohol. structure of the carboxylic acid name of the carboxylic acid structure of the alcohol name of the alcohol
0620_w17_qp_41
THEORY
2017
Paper 4, Variant 1
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Questions Discovered
101