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IGCSEChemistry: Co-ordinated Sciences (Double Award)CIEExam QuestionsOrganic ChemistryOrganic Families

Organic Families (CIE IGCSE Chemistry: Co-ordinated Sciences (Double Award))

Exam Questions

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11 mark

Which of the equations show the incomplete combustion of methane?

  • 2 CH4 + 4O2  → 2 CO2 + 4 H2O

  • CH4 + O2  → C + 2 H2O

  • CH4 + O2  → C + 2 H2

  • 2 CH4 + 4 O2  → 2 CO2 + 4 H2

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21 mark

The diagram shows an industrial process involved in the production of a substance that is used as an aircraft fuel.

q2-11-2-easy-cie-igcse-chemistry

  process substance Q
A fractional distillation petrol
B thermal decomposition paraffin
C fractional distillation paraffin
D thermal decomposition petrol

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    31 mark

    Which of the following statements about ethanol is not correct?

    • It is formed by a reaction between steam and ethane.

    • It can be used as a fuel.

    • It can be used as a solvent.

    • Its functional group is -OH.

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    41 mark

    Ethanol is used as a solvent and fuel, it is produced by the ….1….. of ….2…. .

    Which words would correctly complete the gaps 1 and 2?

      1 2
    A combustion ethane
    B combustion glucose
    C fermentation glucose
    D fermentation ethane

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      11 mark

      The table below shows 4 different sources of petroleum (crude oil) and their composition.

      Fraction Arabian Heavy /% Arabian Light /% Iranian Heavy /%

      North Sea

      /%
      gasoline 18 21 21 23
      kerosene 11.5 13 13 15
      diesel 18 20 20 24
      fuel oil 52.5 46 46 38

      Which composition of petroleum would be the best for the motor vehicle industry?

      • North Sea

      • Arabian Heavy

      • Arabian Light

      • Iranian Heavy

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      21 mark

      A student carried out a cracking reaction on hydrocarbon, P, and obtained two products; Q and R.

      q2-11-2-medium-cie-igcse-chemistryThe student then made the following notes:

      1 Q is unsaturated.
      2 R will decolourise bromine water.
      3 A molecule of P has 7 carbon atoms.

      Which of the statements are correct?

      • 1 & 3

      • 1 & 2

      • 2 & 3

      • 1, 2 & 3

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      31 mark

      Which of the following properties of different compounds in petroleum enable it to be separated into fractions?

        1 Chain length
        2 Chemical reactivity
        3 Solubility in water
        4 Boiling point

      • 1 & 3

      • 1 & 4

      • 2 & 3

      • 2 & 4

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      41 mark

      The diagram below shows the apparatus used to separate petroleum (crude oil) into four fractions.

      q4-11-2-medium-cie-igcse-chem

      Which fraction contains the smallest hydrocarbon molecules?

      fraction boiling point range / °C
      A up to 70
      B 71 to 120
      C 121 to 170
      D over 171

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        51 mark

        Ethanol can be produced from substance Y.

        substance Y + steam rightwards arrow with catalyst on top ethanol

        What is substance Y?

        • Ethane

        • Ethene

        • Carbon dioxide

        • Hydrogen

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        11 mark

        The diagram shows a sequence of reactions.

        q1-11-2-hard-cie-igcse-chemistry

        Which row correctly names the processes P, Q and R?

          P Q R
        A distillation fermentation respiration
        B distillation hydration combustion
        C cracking fermentation respiration
        D cracking hydration combustion

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          21 mark

          Hydrocarbons separated by fractional distillation of petroleum can be cracked to make useful shorter chain products.

          Which substance is not a product of the cracking of propane, Mr 44?

          • C4H8

          • C2H4

          • C3H6

          • H2

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          31 mark

          The apparatus below was used to test gas Y

          q6-1-11-2-hard-cie-igcse-chemistry

          The bromine solution quickly went colourless.

          What is the correct structure of gas Y?

          q6-2-11-2-hard-cie-igcse-chemistry

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