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

Making ethanol by fermentation

19 practice questions

Start practising (8 questions)

Practice questions

1–8 of 8 · Normal

  1. Question 1

    2 marks · Normal

    State two conditions required for the fermentation of glucose to produce ethanol.

    Answer and see the solution →

  2. Question 2

    4 marks · Normal

    (a)

    Describe how ethanol can be made by fermentation of glucose.

    [2 marks]
    (b)

    State the main product formed if the fermentation is carried out in the presence of air.

    [1 mark]
    (c)

    Explain why the fermentation reaction is slow if the temperature is below 30°C.

    [1 mark]
    Answer and see the solution →

  3. Question 3

    3 marks · Normal

    In a fermentation process, 180 g of glucose is completely converted to ethanol and carbon dioxide.

    Calculate the mass of ethanol produced.

    The equation for fermentation is:

    M_r values: glucose (C6H12O6) = 180, ethanol (C2H5OH) = 46

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  4. Question 4

    3 marks · Normal

    Ethanol can be produced by fermentation or by the hydration of ethene.

    Explain two advantages and one disadvantage of making ethanol by fermentation instead of from ethene.

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  5. Question 5

    4 marks · Normal

    (a)
    Data: Rate of ethanol production at different temperatures
    Temperature (°C)Ethanol produced after 2 days (cm³)
    103
    2015
    3028
    4010
    500

    Describe the effect of temperature on the amount of ethanol produced after 2 days.

    [2 marks]
    (b)

    Suggest a temperature range suitable for the fermentation process to produce the most ethanol.

    [1 mark]
    (c)

    Explain why no ethanol is produced at 50°C.

    [1 mark]
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  6. Question 6

    1 mark · Normal

    Which statement about fermentation in ethanol production is correct?

    1. A.Yeast converts glucose to ethanol only at temperatures above 50°C.
    2. B.Fermentation must be carried out in the presence of air.
    3. C.Ethanol is produced by yeast enzymes acting on sugars.
    4. D.Water and carbon dioxide are the only products.
    Answer and check →

  7. Question 7

    2 marks · Normal

    State the balanced chemical equation for the fermentation of glucose to produce ethanol.

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  8. Question 8

    4 marks · Normal

    (a)

    Describe the two main methods used to produce ethanol industrially.

    [2 marks]
    (b)

    State one condition needed for the hydration of ethene to make ethanol.

    [1 mark]
    (c)

    Suggest one reason why hydration of ethene is used in some countries instead of fermentation.

    [1 mark]
    Answer and see the solution →