Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
261–270 of 335 · Normal
Question 261
3 marks · Normal
Answer and see the solution →Ethanoic acid reacts with methanol when heated with a few drops of concentrated sulfuric acid.
(a)[1 mark]State the name given to this type of reaction.
(b)[1 mark]Draw the full structural formula of the ester formed in this reaction.
(c)[1 mark]Explain briefly how the water molecule is formed during this reaction.
Question 262
2 marks · Normal
Answer and see the solution →State two uses of esters in everyday life.
Question 263
4 marks · Normal
Answer and see the solution →A group of chemists are making compounds for use in food and cosmetic products.
(a)[1 mark]State one common property of esters that makes them useful as perfumes.
(b)[2 marks]Name two types of products (other than perfumes) where esters are commonly used as flavourings.
(c)[1 mark]Give a reason why chemists use mixtures of esters in artificial flavourings.
Question 264
3 marks · Normal
Answer and see the solution →Esters are added to both food and perfumes.
Explain why esters are suitable for use in each of these products. Give a reason for each use.
Question 265
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 266
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 267
2 marks · Normal
Answer and see the solution →State two reasons why esters are added to food and drinks.
Question 268
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 269
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 270
2 marks · Normal
Answer and see the solution →State the name of the acid catalyst used in the laboratory preparation of esters, and explain why direct heating with a Bunsen burner should not be used in this experiment.