Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Making ethanol by fermentation
19 practice questions
Practice questions
1–10 of 19
Question 1
1 mark · Easy
Answer and see the solution →State the starting material used in the fermentation process to make ethanol.
Question 2
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 3
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 4
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 5
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 6
1 mark · Easy
Answer and see the solution →Name the chemical that is added to ethene for the direct industrial manufacture of ethanol.
Question 7
3 marks · Easy
Answer and see the solution →Ethanol can be made by adding steam to ethene.
(a)[1 mark]Write the word equation for this reaction.
(b)[1 mark]State one condition needed for this reaction to occur.
(c)[1 mark]Name the type of compound to which ethene belongs.
Question 8
2 marks · Easy
Answer and see the solution →Glucose can be converted to ethanol and carbon dioxide by fermentation.
Calculate the maximum volume of ethanol that can be produced by fermentation of 10 g of glucose at room temperature, if the yield is 100%. Use the following information:
Relative molecular mass (M_r) Molar volume of gas at room temperature Glucose (C_6H_{12}O_6) = 180 Ethanol (C_2H_5OH) = 46 1 mol = 24 dm³ (for gases) Give your answer in grams. (You may assume the density of ethanol is not needed for this calculation.)
Question 9
2 marks · Normal
Answer and see the solution →State two conditions required for the fermentation of glucose to produce ethanol.
Question 10
4 marks · Normal
Answer and see the solution →(a)[2 marks]Describe how ethanol can be made by fermentation of glucose.
(b)[1 mark]State the main product formed if the fermentation is carried out in the presence of air.
(c)[1 mark]Explain why the fermentation reaction is slow if the temperature is below 30°C.