Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
521–530 of 785
Question 521
1 mark · Easy
Answer and see the solution →State one disadvantage of producing ethanol using fermentation instead of the hydration of ethene.
Question 522
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 523
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 524
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 525
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.
Question 526
3 marks · Normal
Answer and see the solution →Ethanol can be produced industrially by fermentation or by hydration of ethene with steam.
(a)[2 marks]Explain why the hydration of ethene is not considered a sustainable process in the long term.
(b)[1 mark]State one environmental advantage of using fermentation instead.
Question 527
2 marks · Normal
Answer and see the solution →State one advantage and one disadvantage of producing ethanol by hydration of ethene rather than by fermentation.
Question 528
4 marks · Normal
Answer and see the solution →Ethanol can be produced industrially by fermentation or by hydration of ethene.
(a)[1 mark]State the raw material used in fermentation to produce ethanol.
(b)[1 mark]State one condition needed for the hydration of ethene to produce ethanol.
(c)[1 mark]Explain one reason why the production of ethanol by fermentation is considered more sustainable than hydration of ethene.
(d)[1 mark]State one reason why the hydration of ethene is more efficient than fermentation for making ethanol.
Question 529
3 marks · Normal
Answer and see the solution →Ethanol is used as a fuel in some countries and can be produced either by fermentation or by hydration of ethene.
Explain, using your knowledge of resources and processing, why some countries may switch from hydration of ethene to fermentation to produce ethanol in the future.
Question 530
4 marks · Normal
Answer and see the solution →The table below gives information about two methods of making ethanol.
Comparison of Ethanol Production Methods Feature Fermentation Hydration of Ethene Raw material Corn or sugar cane (renewable) Ethene from crude oil (non-renewable) Process type Batch, slow Continuous, fast Energy requirement Low High Product purity Impure, needs further processing Very pure (a)[2 marks]Based on the table, give two reasons why a country with limited access to crude oil and plenty of farmland might prefer fermentation to make ethanol.
(b)[1 mark]Give one disadvantage to this country of using fermentation rather than hydration of ethene.
(c)[1 mark]Suggest one way the country could improve the efficiency of ethanol production using fermentation.