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
11–20 of 57 · Normal
Question 11
2 marks · Normal
Answer and see the solution →State the names of the two products formed when ethanol burns completely in air.
Question 12
4 marks · Normal
Answer and see the solution →Ethanol is a member of the alcohol homologous series. When ethanol is burned in air, it reacts with oxygen.
(a)[2 marks]Write a balanced chemical equation for the complete combustion of ethanol.
(b)[2 marks]Give one use of ethanol as a fuel and explain why it is considered a biofuel.
Question 13
3 marks · Normal
Answer and see the solution →Calculate the minimum mass of oxygen needed to completely burn 4.6 g of ethanol ( 2H5OH). (Molar masses: C = 12, H = 1, O = 16)
Question 14
3 marks · Normal
Answer and see the solution →Explain why burning ethanol as a fuel is considered more sustainable than burning petrol. Include reference to raw materials and renewability.
Question 15
4 marks · Normal
Answer and see the solution →The table shows the mass of carbon dioxide produced when different masses of ethanol are burned completely in air.
Data for combustion of ethanol Mass of ethanol burned (g) Mass of carbon dioxide produced (g) 2.3 4.4 4.6 8.8 6.9 13.2 (a)[1 mark]Describe the relationship between the mass of ethanol burned and the mass of carbon dioxide produced.
(b)[2 marks]Calculate the mass of carbon dioxide produced when 11.5 g of ethanol is completely burned.
(c)[1 mark]Suggest a reason why your answer in part b might be slightly lower in a real experiment.
Question 16
1 mark · Normal
Answer and check →Which of the following is the balanced chemical equation for the complete combustion of ethanol in air?
- A.\ce{C2H5OH + 2O2 -> 2CO + 3H2O}
- B.\ce{C2H5OH + 3O2 -> 2CO2 + 3H2O}
- C.\ce{C2H5OH + O2 -> CO2 + H2O}
- D.\ce{C2H5OH + 2O2 -> CO2 + 2H2O}
Question 17
2 marks · Normal
Answer and see the solution →Alcohols including ethanol have similar chemical properties. State one other alcohol (by name or formula) and describe what is observed when it burns in air.
Question 18
4 marks · Normal
Answer and see the solution →Ethanol is used in spirit burners for heating in a laboratory.
(a)[2 marks]Draw the displayed formula of ethanol.
(b)[2 marks]Complete the following word equation for the combustion of ethanol: ethanol + _____ → carbon dioxide + _____
Question 19
2 marks · Normal
Answer and see the solution →Describe what happens when ethanol is oxidised by heating it with potassium dichromate(VI) in dilute sulfuric acid.
Question 20
3 marks · Normal
Answer and see the solution →Explain, using your knowledge of acids and oxidation reactions, why dilute sulfuric acid is needed for potassium dichromate(VI) to oxidise ethanol.