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7 Organic chemistry

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Question 18
F

Figure shows the apparatus a student used to ferment a sugar solution to produce ethanol.

Figure: Apparatus used to ferment a sugar solution to produce ethanol

image

a.

Use Figure to give the temperature of the water in the beaker.

[1]
b.

Name the gas that turns the limewater cloudy.

[1]
c.

The flask is closed with a bung. Explain why air must be kept out of the flask.

[2]
d.

Explain why the water is kept at 30 ∘C30\ ^\circ\text{C}30 ∘C and not at 80 ∘C80\ ^\circ\text{C}80 ∘C.

[2]
Markscheme

7 Organic chemistry Questions

  1. GCSE
  2. /Chemistry
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