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A vegetable oil was shaken with water in flask 1 and with water and an emulsifier in flask 2.
The diagrams show the results after leaving the mixtures to stand for 5 minutes.
a i Give a reason for the result in Flask 1.
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ii Explain the result in Flask 2.
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....................................................................................................................................................(2)
b Give an example of a product that contains an emulsifier and give two ways in which its properties are better than those of the liquids from which it is made.
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....................................................................................................................................................(3)
c Explain how an emulsifier works. Your answer should include a diagram of a simple model of an emulsifier molecule.
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........................................................................................................................................... [H] (4)
