Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
511–520 of 785
Question 511
3 marks · Normal
Answer and see the solution →Ethanol can be made from ethene by hydration.
(a)[1 mark]State the word equation for the hydration of ethene to produce ethanol.
(b)[2 marks]Write the balanced symbol equation for this reaction. Include physical states.
Question 512
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 513
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 514
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 515
1 mark · Easy
Answer and see the solution →State the main raw material used for producing ethanol by the fermentation method.
Question 516
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 517
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 518
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 519
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 520
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.