Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Making ethanol by fermentation
19 practice questions
Practice questions
11–19 of 19
Question 11
3 marks · Normal
Answer and see the solution →In a fermentation process, 180 g of glucose is completely converted to ethanol and carbon dioxide.
Calculate the mass of ethanol produced.
The equation for fermentation is:
M_r values: glucose (C6H12O6) = 180, ethanol (C2H5OH) = 46
Question 12
3 marks · Normal
Answer and see the solution →Ethanol can be produced by fermentation or by the hydration of ethene.
Explain two advantages and one disadvantage of making ethanol by fermentation instead of from ethene.
Question 13
4 marks · Normal
Answer and see the solution →(a)[2 marks]Data: Rate of ethanol production at different temperatures Temperature (°C) Ethanol produced after 2 days (cm³) 10 3 20 15 30 28 40 10 50 0 Describe the effect of temperature on the amount of ethanol produced after 2 days.
(b)[1 mark]Suggest a temperature range suitable for the fermentation process to produce the most ethanol.
(c)[1 mark]Explain why no ethanol is produced at 50°C.
Question 14
1 mark · Normal
Answer and check →Which statement about fermentation in ethanol production is correct?
- A.Yeast converts glucose to ethanol only at temperatures above 50°C.
- B.Fermentation must be carried out in the presence of air.
- C.Ethanol is produced by yeast enzymes acting on sugars.
- D.Water and carbon dioxide are the only products.
Question 15
2 marks · Normal
Answer and see the solution →State the balanced chemical equation for the fermentation of glucose to produce ethanol.
Question 16
4 marks · Normal
Answer and see the solution →(a)[2 marks]Describe the two main methods used to produce ethanol industrially.
(b)[1 mark]State one condition needed for the hydration of ethene to make ethanol.
(c)[1 mark]Suggest one reason why hydration of ethene is used in some countries instead of fermentation.
Question 17
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 18
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 19
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.