Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Esters
68 practice questions
Topics covered
Practice questions
31–40 of 68
Question 31
4 marks · Normal
Answer and see the solution →Table 1 shows the common smells of some esters.
Common smells of esters Ester Smell Methyl butanoate Apple Ethyl butanoate Pineapple Propyl ethanoate Pear Pentyl ethanoate Banana (a)[1 mark]State which ester would be suitable to add a pear flavour to a drink.
(b)[1 mark]Give one reason why esters are used in food flavourings.
(c)[1 mark]A manufacturer wants to create a banana-flavoured sweet. Name the ester they should use.
(d)[1 mark]Suggest why perfumes often contain a mixture of esters.
Question 32
1 mark · Normal
Answer and check →Which of the following is a typical use of esters?
- A.As a food flavouring
- B.To increase the melting point of metals
- C.As a source of carbon dioxide
- D.To make fertilisers
Question 33
2 marks · Normal
Answer and see the solution →State two reasons why esters are added to food and drinks.
Question 34
4 marks · Normal
Answer and see the solution →A chemist is developing a new perfume with a fruity scent.
(a)[1 mark]Suggest why esters are often used in making perfumes.
(b)[1 mark]State one property of esters that helps the scent of a perfume spread easily.
(c)[1 mark]Other than perfumes, name one use of esters.
(d)[1 mark]Explain how the use of esters benefits manufacturers of food products.
Question 35
3 marks · Normal
Answer and see the solution →Esters are widely used in everyday products.
(a)[1 mark]State one use of esters as a flavouring in the food industry.
(b)Perfume manufacturers often use mixtures including esters.
(i)[1 mark]State why esters are useful in perfumes.
(c)[1 mark]A chemist designs an artificial pear flavour. Estimate how many individual esters, from the following list, could be combined for this purpose: ethyl ethanoate, methyl butanoate, propyl ethanoate, and butyl methanoate.
Question 36
2 marks · Hard
Answer and see the solution →State two reasons why esters are important in the manufacturing of everyday consumer products.
Question 37
5 marks · Hard
Answer and see the solution →A company is designing a new skincare lotion and a fruit-flavoured soft drink. They wish to add esters to both products.
(a)[1 mark]State a reason why esters are added to skincare lotions.
(b)[2 marks]Explain why esters are commonly chosen to flavour fruit-based soft drinks.
(c)[1 mark]Name one property of esters that makes them suitable for both products.
(d)[1 mark]Suggest another everyday product, not mentioned above, that commonly contains esters for a similar reason.
Question 38
2 marks · Hard
Answer and see the solution →Perfume and ice cream manufacturers both use esters. State the use of esters in each product.
Question 39
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 40
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.