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
31–40 of 130
Question 31
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 32
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 33
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 34
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 35
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 36
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 37
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 38
2 marks · Hard
Answer and see the solution →Describe what would be observed if ethanol vapour is passed over heated copper(II) oxide, and state the type of reaction taking place.
Question 39
5 marks · Hard
Answer and see the solution →A student investigates the combustion of ethanol and oxidation by potassium dichromate. Study the following information and answer the questions that follow.
(a)[1 mark]Write the structural formula of ethanol.
(b)[2 marks]Ethanol burns completely in air. Name the two products formed in this reaction and state whether this reaction is exothermic or endothermic.
(c)[2 marks]Describe what is observed when ethanol is warmed with acidified potassium dichromate(VI) solution.
Question 40
2 marks · Hard
Answer and see the solution →Explain why water is always formed as a product when any alcohol burns completely in air.