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
41–50 of 52 · Easy
Question 41
1 mark · Easy
Answer and see the solution →State the main raw material used for producing ethanol by the fermentation method.
Question 42
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 43
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 44
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 45
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 46
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 47
1 mark · Easy
Answer and see the solution →State one disadvantage of producing ethanol using fermentation instead of the hydration of ethene.
Question 48
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 49
5 marks · Easy
Answer and see the solution →This question is about alcohols and what happens when ethanol burns in air.
(a)[1 mark]Name an alcohol with three carbon atoms.
(b)[2 marks]Draw the displayed formula of ethanol, showing all atoms and bonds.
(c)[2 marks]Ethanol reacts with oxygen when it burns. Write the balanced chemical equation for the complete combustion of ethanol.
Question 50
5 marks · Easy
Answer and see the solution →Methanol and ethanol are both alcohols used as fuels.
(a)[1 mark]State the IUPAC name for the alcohol with molecular formula CH4O.
(b)[2 marks]Explain how the –OH functional group in ethanol affects its chemical properties compared to alkanes.
(c)[2 marks]Describe what happens in the combustion of ethanol, including the products formed.