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
21–30 of 52 · Easy
Question 21
1 mark · Easy
Answer and see the solution →Give the name of the organic product formed when ethanol is oxidised by heating with potassium dichromate(VI) in dilute sulfuric acid.
Question 22
3 marks · Easy
Answer and see the solution →(a)[1 mark]Describe the observable change in colour that occurs when ethanol is oxidised by heating with potassium dichromate(VI) in dilute sulfuric acid.
(b)[1 mark]What does this colour change indicate about the potassium dichromate(VI) during the reaction?
(c)[1 mark]Suggest what you would observe if the solution is heated without adding ethanol.
Question 23
2 marks · Easy
Answer and see the solution →Ethanol can be oxidised by heating it with potassium dichromate(VI) in dilute sulfuric acid.
Calculate the number of different substances (including ethanol and all reagents used) that must be present in the test-tube for this reaction to occur, according to standard laboratory practice.
Show your working.
Question 24
2 marks · Easy
Answer and see the solution →The oxidation of ethanol with potassium dichromate(VI) requires dilute sulfuric acid.
A chemist accidentally forgets to add any dilute sulfuric acid to the test-tube, while potassium dichromate(VI) and ethanol are both present.
Calculate the number of moles of H+ ions available to the reaction in this mistake, assuming none are present in the other reagents.
Show your working and state the reason for your answer.
Question 25
1 mark · Easy
Answer and see the solution →State the starting material used in the fermentation process to make ethanol.
Question 26
3 marks · Easy
Answer and see the solution →The diagram below shows a simple set-up for producing ethanol by fermentation.
Apparatus for fermentation (a)[1 mark]Name the microorganism used in this process.
(b)[1 mark]State one condition, other than the absence of air, needed for fermentation to occur efficiently.
(c)[1 mark]What is observed in the boiling tube containing limewater when fermentation takes place?
Question 27
2 marks · Easy
Answer and see the solution →In a fermentation reaction, 60 g of glucose are converted to ethanol and carbon dioxide. Calculate the maximum mass of ethanol that could be produced, using the equation:
(Relative formula masses: C6H12O6 = 180, C2H5OH = 46)
Question 28
2 marks · Easy
Answer and see the solution →Ethanol may be made by fermentation or by reacting ethene with steam.
Explain why it is important to keep air out of the fermentation vessel.
Question 29
3 marks · Easy
Answer and see the solution →A student carries out fermentation at different temperatures. The table shows the volume of ethanol made after 3 days.
Ethanol production vs temperature Temperature (°C) Ethanol produced (cm³) 15 12 25 30 35 33 45 10 (a)[1 mark]At which temperature was the highest volume of ethanol produced?
(b)[1 mark]Suggest why the volume of ethanol is lower at 45°C.
(c)[1 mark]How does temperature affect the rate of fermentation based on this data?
Question 30
1 mark · Easy
Answer and see the solution →Name the chemical that is added to ethene for the direct industrial manufacture of ethanol.