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 52 · Easy
Question 11
2 marks · Easy
Answer and see the solution →Calculate the total number of oxygen atoms in the products formed when one molecule of ethanol combusts completely in air. Show your working.
Question 12
3 marks · Easy
Answer and see the solution →The table shows the volume of carbon dioxide produced when different volumes of ethanol are completely burned in air.
Volumes of ethanol and carbon dioxide from combustion Volume of ethanol burned (cm^3) Volume of CO2 produced (cm^3) 1 2 2 4 3 6 4 8 (a)[1 mark]Describe the relationship between the volume of ethanol burned and the volume of carbon dioxide produced.
(b)[1 mark]Predict the volume of carbon dioxide produced if 5 cm^3 of ethanol is completely burned.
(c)[1 mark]Suggest why the volume of carbon dioxide produced is always double the volume of ethanol burned.
Question 13
3 marks · Easy
Answer and see the solution →The combustion of ethanol can be used as a source of energy in stoves.
(a)[1 mark]Write the molecular formula for ethanol.
(b)[1 mark]Describe what you would observe when ethanol burns in air.
(c)[1 mark]Name one use of ethanol apart from as a fuel.
Question 14
2 marks · Easy
Answer and see the solution →Calculate the mass of carbon dioxide produced when 4.6 g of ethanol burn completely in air.
(Relative atomic masses: C = 12, H = 1, O = 16)
Question 15
2 marks · Easy
Answer and see the solution →Ethanol burns in air to produce two products. Describe, in terms of substances, what is formed when ethanol undergoes complete combustion, and explain why these products are formed.
Question 16
1 mark · Easy
Answer and see the solution →State the name of one product formed when ethanol burns completely in air.
Question 17
1 mark · Easy
Answer and see the solution →State the initial colour of the potassium dichromate(VI) solution before ethanol is heated with it.
Question 18
3 marks · Easy
Answer and see the solution →(a)[2 marks]Explain why dilute sulfuric acid must be present for potassium dichromate(VI) to oxidise ethanol.
(b)[1 mark]State the role of sulfuric acid in this reaction.
Question 19
2 marks · Easy
Answer and see the solution →A student observes the colour change when ethanol is heated with potassium dichromate(VI) in dilute sulfuric acid. Explain why the green colour appears during this reaction.
Question 20
3 marks · Easy
Answer and see the solution →Results from three experiments on ethanol oxidation Experiment Potassium dichromate(VI) Dilute sulfuric acid Observed colour change 1 Yes Yes Orange to green 2 Yes No Orange, no change 3 No Yes Colourless, no change Using the data from the table, explain in terms of ions, the importance of dilute sulfuric acid for this experiment.