7.7 Alcohols
6 exam questions worth 10 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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Which functional group is found in all alcohols?
Choose one answer.
Correct Not quite: the answer is –OH
Mark scheme
B
Model answer
B: alcohols contain the –OH group.
Give the formula of propanol.
Mark scheme
- C3H7OH (1)
Model answer
C3H7OH
Describe what you would see when a small piece of sodium is added to ethanol, and name the gas produced.
Mark scheme
- fizzing / bubbles / sodium gets smaller (1)
- hydrogen (1)
Model answer
The sodium fizzes gently as hydrogen gas is produced.
Give the conditions needed to make ethanol by fermentation.
Mark scheme
- yeast (1)
- temperature of about 25–35 °C (1)
- no air / anaerobic (1)
Model answer
Sugar solution with yeast, kept warm at about 30 °C, with air kept out.
Explain how a more concentrated solution of ethanol is obtained from the fermentation mixture.
Mark scheme
- fractional distillation (1)
- ethanol has a lower boiling point than water, so it evaporates first (1)
Model answer
By fractional distillation: ethanol boils at 78 °C, lower than water, so it evaporates first and can be collected.
Name the type of compound formed when ethanol is oxidised.
Mark scheme
- carboxylic acid / ethanoic acid (1)
Model answer
A carboxylic acid: ethanoic acid.
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