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
101–110 of 130
Question 101
3 marks · Easy
Answer and see the solution →The two main methods of producing ethanol industrially are by fermentation and by the hydration of ethene.
(a)[1 mark]State one reason why fermentation is considered more sustainable than hydration of ethene.
(b)[1 mark]Describe one disadvantage of using fermentation to produce ethanol.
(c)[1 mark]Give one reason why hydration of ethene is more efficient than fermentation.
Question 102
2 marks · Easy
Answer and see the solution →Explain, in terms of resources, one advantage and one disadvantage of the hydration of ethene method for producing ethanol.
Question 103
3 marks · Easy
Answer and see the solution →The table below compares some features of ethanol production by fermentation and by hydration of ethene.
Feature Fermentation Hydration of ethene Raw material Sugar beet or corn (renewable) Ethene (from oil, non-renewable) Process type Batch Continuous Speed Slow Fast (a)[1 mark]Which process uses a renewable raw material?
(b)[1 mark]What type of process is the hydration of ethene?
(c)[1 mark]Compare the speed of ethanol production in both methods.
Question 104
3 marks · Easy
Answer and see the solution →Countries without access to oil often use fermentation to produce ethanol.
(a)[1 mark]State one reason why some countries choose fermentation over hydration of ethene.
(b)[1 mark]Describe one condition needed during fermentation.
(c)[1 mark]Give one disadvantage of ethanol produced by fermentation.
Question 105
2 marks · Easy
Answer and see the solution →A company must decide between using fermentation or the hydration of ethene to make ethanol. The fermentation process requires less energy but is much slower. The company finds it can make 180 tonnes of ethanol per week by fermentation, but 540 tonnes per week by hydration of ethene.
Calculate how many times faster the hydration of ethene method is compared to fermentation. Show your working.
Question 106
1 mark · Easy
Answer and see the solution →State one disadvantage of producing ethanol using fermentation instead of the hydration of ethene.
Question 107
2 marks · Easy
Answer and see the solution →A chemical company can produce 50 tonnes of ethanol per week using either fermentation or hydration of ethene. The batch fermentation process is only 60% as efficient as the continuous hydration process.
Calculate how many tonnes of ethanol the company would produce per week if it switched from fermentation to hydration of ethene. Give your answer to the nearest tonne.
Question 108
2 marks · Normal
Answer and see the solution →State one advantage and one disadvantage of producing ethanol by fermentation compared to the hydration of ethene.
Question 109
4 marks · Normal
Answer and see the solution →The table below gives some information about two industrial methods for making ethanol.
Fermentation Hydration of Ethene Batch process Continuous process Sugar beet or corn used Ethene from crude oil used Slower (days) Faster (hours) Low temperature and pressure High temperature and pressure (a)[1 mark]Give one reason why some countries prefer making ethanol by fermentation.
(b)[1 mark]State one process feature that makes hydration of ethene more efficient than fermentation.
(c)[2 marks]Explain why ethanol from fermentation needs further processing before it can be used as a chemical feedstock.
Question 110
3 marks · Normal
Answer and see the solution →A chemical company can produce ethanol by either fermentation or hydration of ethene.
(a)[1 mark]The hydration of ethene gives ethanol that is 99% pure by mass. If 5.0 tonnes of ethanol are made, calculate the mass of pure ethanol obtained.
(b)[1 mark]Fermentation produces ethanol that is only 90% pure by mass from the same 5.0 tonnes. Calculate the mass of pure ethanol produced.
(c)[1 mark]Based on your answers, explain one advantage of the hydration method.