Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
211–220 of 317 · Easy
Question 211
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 212
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 213
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 214
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 215
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 216
1 mark · Easy
Answer and see the solution →State one disadvantage of producing ethanol using fermentation instead of the hydration of ethene.
Question 217
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 218
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 219
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.
Question 220
5 marks · Easy
Answer and see the solution →Ethanol can be used as a fuel. The equation for its complete combustion is:
(a)[1 mark]State the molecular formula of ethanol.
(b)[1 mark]How many moles of carbon dioxide are made from 1 mole of ethanol in complete combustion?
(c)[3 marks]Calculate the total number of oxygen atoms found in the water produced when 0.5 mol of ethanol burns completely. (Show your working.)