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GCSE
Gcse Chemistry
Emulsions
Solution
Q.1.
Which of the following is NOT an example of an emulsion?
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Milk
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Mayonnaise
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Emulsion paint
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Gloss paint
Q.2.
What is an emulsifier?
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A substance that stabilises an emulsion
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A type of paint
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A substance that enables others to separate
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A substance that lowers the boiling point of water
Q.3.
An emulsifier molecule has two ends. Pick the correct combination of these two ends.
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hydrophobic - head - water hating hydrophilic - tail - water loving
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hydrophobic - tail - water hating hydrophilic - head - water loving
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hydrophobic - tail - water loving hydrophilic - tail - water hating
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hydrophobic - tail - water loving hydrophilic - head - water hating
Q.4.
Pick the combination for what the two ends of the emulsifier molecules do.
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hydrophilic head - attracted to water hydrophobic tail - attracted to oil
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hydrophilic head - attracted to oil hydrophobic tail - attracted to water
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hydrophobic head - attracted to water hydrophilic tail - attracted to oil
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hydrophobic head - attracted to oil hydrophilic tail - attracted to water
Q.5.
If an emulsion is left to stand, what will eventually happen?
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The mixture will remain mixed
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A layer of water will settle on top of the oil
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A layer of oil will settle on top of the water
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The mixture will evaporate
Q.6.
Which of the following is an emulsifier?
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Vegetable oil
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Egg white
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Milk
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Egg yolk
Q.7.
When oil tankers sink and lose their oil into the ocean, detergents can be used to help clean up the damage done by the oil. Why does this work?
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The detergent dissolves the oil
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The detergent acts as an emulsifier and separates the oil and water long enough for the oil to be removed
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The detergent forces the oil to dissolve in the water
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The detergent breaks down the oil and disperses it over a much larger area
Q.8.
Why is detergent rarely used in the way mentioned in question 8?
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It is more effective than other methods
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It doesn't work
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It is relatively expensive and the spills are usually far too large to be treated in this manner
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It doesn't work quickly enough
Q.9.
When sea birds that have been coated in oil following an oil spill are treated with detergent, they often don't survive. Why?
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The detergent strips the birds of their natural protective oils
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The detergents cause diseases
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The detergents harm their skin
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The detergents clog up the feathers
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