SubjectCover

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

Organic Chemistry

785 practice questions

Start practising (335 questions)

Topics covered

Practice questions

191–200 of 335 · Normal

  1. Question 191

    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]
    Answer and see the solution →

  2. Question 192

    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}
    Answer and check →

  3. Question 193

    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.

    Answer and see the solution →

  4. Question 194

    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]
    Answer and see the solution →

  5. Question 195

    2 marks · Normal

    Describe what happens when ethanol is oxidised by heating it with potassium dichromate(VI) in dilute sulfuric acid.

    Answer and see the solution →

  6. Question 196

    3 marks · Normal

    Explain, using your knowledge of acids and oxidation reactions, why dilute sulfuric acid is needed for potassium dichromate(VI) to oxidise ethanol.

    Answer and see the solution →

  7. Question 197

    3 marks · Normal

    Ethanol is sometimes used to make vinegar by oxidation. Explain, in terms of the laboratory process, how a chemist could use potassium dichromate(VI) and dilute sulfuric acid to produce ethanoic acid from ethanol.

    Answer and see the solution →

  8. Question 198

    4 marks · Normal

    The table shows the initial and final colours observed when ethanol is heated with potassium dichromate(VI) and dilute sulfuric acid.

    Observation of Colour Changes during Oxidation
    TestInitial colourFinal colour
    AOrangeGreen
    BOrangeOrange
    COrangeGreen

    Explain what has happened in each test. Suggest a reason why the outcome was different in test B.

    Answer and see the solution →

  9. Question 199

    1 mark · Normal

    Which statement best explains the role of dilute sulfuric acid in the oxidation of ethanol with potassium dichromate(VI)?

    1. A.It provides hydrogen ions needed for the reaction.
    2. B.It acts as a catalyst for ethanol oxidation.
    3. C.It reacts with ethanol to make ethene.
    4. D.It neutralises the potassium dichromate(VI).
    Answer and check →

  10. Question 200

    2 marks · Normal

    State the reagents and conditions required to oxidise ethanol to ethanoic acid in the laboratory.

    Answer and see the solution →