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Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section

Ethanol burns in air

19 practice questions

Start practising (19 questions)

Practice questions

11–19 of 19

  1. Question 11

    3 marks · Normal

    Calculate the minimum mass of oxygen needed to completely burn 4.6 g of ethanol ( 2H5OH). (Molar masses: C = 12, H = 1, O = 16)

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  2. Question 12

    3 marks · Normal

    Explain why burning ethanol as a fuel is considered more sustainable than burning petrol. Include reference to raw materials and renewability.

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  3. Question 13

    4 marks · Normal

    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)
    2.34.4
    4.68.8
    6.913.2
    (a)

    Describe the relationship between the mass of ethanol burned and the mass of carbon dioxide produced.

    [1 mark]
    (b)

    Calculate the mass of carbon dioxide produced when 11.5 g of ethanol is completely burned.

    [2 marks]
    (c)

    Suggest a reason why your answer in part b might be slightly lower in a real experiment.

    [1 mark]
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  4. Question 14

    1 mark · Normal

    Which of the following is the balanced chemical equation for the complete combustion of ethanol in air?

    1. A.\ce{C2H5OH + 2O2 -> 2CO + 3H2O}
    2. B.\ce{C2H5OH + 3O2 -> 2CO2 + 3H2O}
    3. C.\ce{C2H5OH + O2 -> CO2 + H2O}
    4. D.\ce{C2H5OH + 2O2 -> CO2 + 2H2O}
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  5. Question 15

    2 marks · Normal

    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.

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  6. Question 16

    4 marks · Normal

    Ethanol is used in spirit burners for heating in a laboratory.

    (a)

    Draw the displayed formula of ethanol.

    [2 marks]
    (b)

    Complete the following word equation for the combustion of ethanol: ethanol + _____ → carbon dioxide + _____

    [2 marks]
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  7. Question 17

    2 marks · Hard

    Describe what would be observed if ethanol vapour is passed over heated copper(II) oxide, and state the type of reaction taking place.

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  8. Question 18

    5 marks · Hard

    A student investigates the combustion of ethanol and oxidation by potassium dichromate. Study the following information and answer the questions that follow.

    (a)

    Write the structural formula of ethanol.

    [1 mark]
    (b)

    Ethanol burns completely in air. Name the two products formed in this reaction and state whether this reaction is exothermic or endothermic.

    [2 marks]
    (c)

    Describe what is observed when ethanol is warmed with acidified potassium dichromate(VI) solution.

    [2 marks]
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  9. Question 19

    2 marks · Hard

    Explain why water is always formed as a product when any alcohol burns completely in air.

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