Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
441–450 of 785
Question 441
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 442
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 443
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 444
1 mark · Easy
Answer and see the solution →State the name of one product formed when ethanol burns completely in air.
Question 445
2 marks · Normal
Answer and see the solution →State the names of the two products formed when ethanol burns completely in air.
Question 446
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 447
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 448
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 449
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 450
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}