Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
491–500 of 785
Question 491
2 marks · Normal
Answer and see the solution →State the balanced chemical equation for the fermentation of glucose to produce ethanol.
Question 492
4 marks · Normal
Answer and see the solution →(a)[2 marks]Describe the two main methods used to produce ethanol industrially.
(b)[1 mark]State one condition needed for the hydration of ethene to make ethanol.
(c)[1 mark]Suggest one reason why hydration of ethene is used in some countries instead of fermentation.
Question 493
2 marks · Hard
Answer and see the solution →State two reasons why anaerobic conditions are important during the fermentation of glucose to make ethanol.
Question 494
5 marks · Hard
Answer and see the solution →A chemical company wants to maximise ethanol production using fermentation.
(a)[2 marks]Describe how yeast, glucose solution, and temperature are used to maximise ethanol production in this process.
(b)[1 mark]Explain why the mixture is kept in the absence of air.
(c)[2 marks]Suggest what would happen if the temperature during fermentation reaches 50°C. Give a reason for your answer.
Question 495
2 marks · Hard
Answer and see the solution →Explain why a temperature of 35°C is better than 10°C for fermentation of glucose to produce ethanol.
Question 496
1 mark · Easy
Answer and see the solution →Explain what happens to the unreacted ethene during the industrial hydration process to make ethanol.
Question 497
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the word equation for the hydration of ethene to produce ethanol.
(b)[2 marks]Write the balanced symbol equation for the reaction.
Question 498
2 marks · Easy
Answer and see the solution →The hydration of ethene is carried out at high temperature and pressure in the presence of a catalyst.
(a)[1 mark]State the temperature (in °C) commonly used in this process.
(b)[1 mark]Give the range of pressures (in atmospheres) that is typically used.
Question 499
2 marks · Easy
Answer and see the solution →Explain why unreacted ethene is recycled during the production of ethanol by hydration of ethene.
Question 500
3 marks · Easy
Answer and see the solution →Masses involved in the hydration of ethene experiment Substance Mass used (g) Ethene 56 Steam 18 Ethanol 74 (a)[1 mark]Based on the table, write the word equation for the hydration of ethene.
(b)[1 mark]Write the balanced symbol equation for this reaction.
(c)[1 mark]State the mass of ethanol produced when 56 g of ethene reacts completely.