Question 6
FFigure 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
a.[1]
Use Figure to give the temperature of the water in the beaker.
b.[1]
Name the gas that turns the limewater cloudy.
c.[2]
The flask is closed with a bung. Explain why air must be kept out of the flask.
d.[2]
Explain why the water is kept at 30 ∘C30\ ^\circ\text{C}30 ∘C and not at 80 ∘C80\ ^\circ\text{C}80 ∘C.
7.2 Reactions of alkenes and alcohols Questions
40 exam-style questions on AQA GCSE Chemistry 7.2 Reactions of alkenes and alcohols, covering 7.2.1 Structure and formulae of alkenes, 7.2.2 Reactions of alkenes, 7.2.3 Alcohols, 7.2.4a Carboxylic acids, and 7.2.4b Carboxylic acids as weak acids. Each one has a worked solution and a mark scheme showing where the marks go.