Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
251–260 of 317 · Easy
Question 251
3 marks · Easy
Answer and see the solution →Table 1: Some esters and their typical uses. Ester Typical use Methyl butanoate Flavouring (apple) Ethyl ethanoate Solvent Propyl ethanoate Perfume Pentyl acetate Flavouring (banana) (a)[1 mark]Identify two esters from the table used as flavourings.
(b)[1 mark]Which ester from the table is used as a perfume?
(c)[1 mark]Give the fruit each flavouring (from part a) is associated with.
Question 252
1 mark · Easy
Answer and see the solution →State the main reason esters are chosen for making perfumes.
Question 253
3 marks · Easy
Answer and see the solution →(a)[1 mark]Name one ester used for a fruit flavouring in food.
(b)[1 mark]State what property of esters makes them useful as perfumes.
(c)[1 mark]Give one example of a product (other than food) where esters are used.
Question 254
3 marks · Easy
Answer and see the solution →(a)[1 mark]State one use of esters in the food industry.
(b)[1 mark]State one use of esters in the perfume industry.
(c)[1 mark]Give one property of esters that makes them suitable for these uses.
Question 255
2 marks · Easy
Answer and see the solution →A manufacturer wants to make a new strawberry-flavoured sweet. State which type of organic compound they should use to add the flavour and explain briefly why.
Question 256
2 marks · Easy
Answer and see the solution →A food company wants to make a new sweet product with a fruity taste and a pleasant smell. They plan to add 0.5 grams of an ester as a flavouring and 0.7 grams of an ester as a perfume in one batch.
State the total mass of ester (in grams) added to this batch and identify the two main uses of esters in this context.
Question 257
1 mark · Easy
Answer and see the solution →State the catalyst commonly used in the laboratory preparation of esters from a carboxylic acid and an alcohol.
Question 258
3 marks · Easy
Answer and see the solution →(a)[1 mark]Give the names of the acid and alcohol used to make ethyl propanoate in the laboratory.
(b)[1 mark]State one safety precaution you should take while mixing the reactants.
(c)[1 mark]Describe how the ester can be separated from the reaction mixture after heating.
Question 259
2 marks · Easy
Answer and see the solution →Explain why the mixture of reactants is heated in a beaker of hot water rather than directly over a Bunsen burner when making esters in the laboratory.
Question 260
3 marks · Easy
Answer and see the solution →Table showing combinations and smells of esters made in a laboratory. Alcohol used Carboxylic acid used Ester formed Smell Ethanol Ethanoic acid Ethyl ethanoate Fruity, sweet Propan-1-ol Propanoic acid Propyl propanoate Banana-like Butanol Butanoic acid Butyl butanoate Pineapple (a)[1 mark]Which combination produces an ester that smells like pineapple?
(b)[1 mark]State the alcohol and carboxylic acid needed to make an ester with a banana-like smell.
(c)[1 mark]Suggest one reason why not much ester is formed during these short laboratory reactions.