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
61–70 of 130
Question 61
2 marks · Hard
Answer and see the solution →Explain why dilute sulfuric acid must be present when potassium dichromate(VI) is used to oxidise ethanol. Include in your answer the role that the acid plays in the reaction.
Question 62
1 mark · Easy
Answer and see the solution →State the starting material used in the fermentation process to make ethanol.
Question 63
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 64
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 65
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 66
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 67
1 mark · Easy
Answer and see the solution →Name the chemical that is added to ethene for the direct industrial manufacture of ethanol.
Question 68
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 69
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 70
2 marks · Normal
Answer and see the solution →State two conditions required for the fermentation of glucose to produce ethanol.