Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Esters
68 practice questions
Topics covered
Practice questions
21–28 of 28 · Easy
Question 21
1 mark · Easy
Answer and see the solution →What is the correct method for smelling the ester produced in a laboratory preparation?
Question 22
3 marks · Easy
Answer and see the solution →A student is making propyl ethanoate in the laboratory.
(a)[1 mark]Write the names of the starting alcohol and carboxylic acid.
(b)[1 mark]Name the layer that will float on the water after adding sodium carbonate solution.
(c)[1 mark]State why the ester floats on water, but the alcohol and acid do not.
Question 23
2 marks · Easy
Answer and see the solution →A student follows the laboratory method to prepare an ester using 2 cm³ of ethanol (density = 0.79 g/cm³) and 2 cm³ of ethanoic acid (density = 1.05 g/cm³). Calculate the total mass of reactants (ethanol and ethanoic acid) used, in grams. Give your answer to 2 decimal places.
Question 24
2 marks · Easy
Answer and see the solution →During an esterification experiment, a student collects a layer of ester with a volume of 0.7 cm³. If the density of the ester is 0.91 g/cm³, calculate the mass of ester produced. Give your answer to 2 decimal places.
Question 25
5 marks · Easy
Answer and see the solution →Esters are made by reacting an alcohol with a carboxylic acid in the presence of an acid catalyst. They are used as flavourings and perfumes.
(a)[1 mark]Name the products when methanol reacts with ethanoic acid under suitable conditions.
(b)[2 marks]Draw the fully displayed structural formula of the ester formed in part (a).
(c)[1 mark]Give one common use of esters.
(d)[1 mark]Esters have a sweet smell. State whether this property makes them suitable for use as solvents, perfumes, or both. Explain your answer.
Question 26
5 marks · Easy
Answer and see the solution →Ethyl propanoate is an ester formed in organic chemistry reactions.
(a)[2 marks]Write the names of the alcohol and the carboxylic acid used to make ethyl propanoate.
(b)[1 mark]State one typical use for esters such as ethyl propanoate.
(c)[2 marks]Draw the structural formula for ethyl propanoate.
Question 27
5 marks · Easy
Answer and see the solution →The reaction between propanoic acid and methanol produces methyl propanoate and water.
(a)[2 marks]Write a balanced equation (using formulae) for the reaction of methanol and propanoic acid to form an ester.
(b)[1 mark]Name the ester formed in this reaction.
(c)[1 mark]Give one reason why esters are added to food and drink products.
(d)[1 mark]If 0.1 mol of propanoic acid and 0.1 mol of methanol are reacted, calculate the maximum amount (in mol) of ester that can be produced.
Question 28
5 marks · Easy
Answer and see the solution →Esters such as propyl methanoate have distinctive smells and are made by reacting an alcohol with a carboxylic acid.
(a)[2 marks]State the name of the alcohol and the carboxylic acid used to form propyl methanoate.
(b)[2 marks]Draw the displayed formula of propyl methanoate, showing all atoms and bonds.
(c)[1 mark]State one use of esters such as propyl methanoate.