Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Alcohols
130 practice questions
Topics covered
- Drawing and naming the alcohols21 practice questions
- Ethanol burns in air19 practice questions
- Ethanol can be oxidised by heating with potassium dichromate(VI) in dilute sulfuric acid21 practice questions
- Making ethanol by fermentation19 practice questions
- Making ethanol by the hydration of ethene19 practice questions
- Comparing the two methods of producing ethanol20 practice questions
Practice questions
11–20 of 21 · Hard
Question 11
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 12
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.
Question 13
2 marks · Hard
Answer and see the solution →State the temperature and pressure conditions required for the industrial hydration of ethene to make ethanol.
Question 14
5 marks · Hard
Answer and see the solution →In the industrial process to make ethanol from ethene, only some of the ethene reacts in a single pass through the reactor.
(a)[2 marks]Explain what happens to the ethene that does not react during one pass through the reactor.
(b)[2 marks]Describe one advantage of recycling the unreacted ethene in this process.
(c)[1 mark]Suggest what effect not recycling unreacted ethene would have on the overall yield of ethanol.
Question 15
2 marks · Hard
Answer and see the solution →Give the word equation and the balanced symbol equation for making ethanol by hydration of ethene.
Question 16
2 marks · Hard
Answer and see the solution →State one reason why ethanol produced by fermentation may need further processing, and one reason why ethanol produced by hydration of ethene is considered more efficient.
Question 17
5 marks · Hard
Answer and see the solution →A chemical company is choosing between fermentation and hydration of ethene to manufacture ethanol.
(a)[2 marks]State one raw material used in each method.
(b)[1 mark]Explain one environmental advantage of using fermentation rather than hydration to produce ethanol.
(c)[1 mark]Describe one disadvantage of fermentation compared to hydration of ethene for industrial production of ethanol.
(d)[1 mark]State one condition or feature of the hydration of ethene process that makes it more efficient industrially than fermentation.
Question 18
2 marks · Hard
Answer and see the solution →Give one reason why the fermentation method for producing ethanol is not as sustainable as it first appears, and one limitation of the hydration of ethene method for future production.
Question 19
7 marks · Hard
Answer and see the solution →Ethanol can be produced via different industrial methods. One method involves the hydration of ethene, and another involves fermentation of sugars.
(a)[1 mark]State the word equation for the hydration of ethene to form ethanol.
(b)[1 mark]Write the balanced symbol equation for this reaction.
(c)[2 marks]Fermentation is an alternative method for producing ethanol. List two advantages of using fermentation compared to hydration of ethene.
(d)[2 marks]State one disadvantage of ethanol production by fermentation and one disadvantage of ethanol production by hydration of ethene.
(e)[1 mark]Explain why some countries prefer one method over the other for ethanol production.
Question 20
7 marks · Hard
Answer and see the solution →The table shows two industrial methods for producing ethanol: hydration of ethene and fermentation of glucose.
(a)[3 marks]State the temperature, pressure and catalyst required for the hydration of ethene to make ethanol.
(b)[2 marks]Compare the energy requirements for the hydration of ethene and fermentation methods. Give one reason for the difference.
(c)[2 marks]State one advantage and one disadvantage of the hydration method compared to fermentation.