Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Making ethanol by fermentation
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →State two reasons why anaerobic conditions are important during the fermentation of glucose to make ethanol.
Question 2
5 marks · Hard
Answer and see the solution →A chemical company wants to maximise ethanol production using fermentation.
(a)[2 marks]Describe how yeast, glucose solution, and temperature are used to maximise ethanol production in this process.
(b)[1 mark]Explain why the mixture is kept in the absence of air.
(c)[2 marks]Suggest what would happen if the temperature during fermentation reaches 50°C. Give a reason for your answer.
Question 3
2 marks · Hard
Answer and see the solution →Explain why a temperature of 35°C is better than 10°C for fermentation of glucose to produce ethanol.