Organic Chemistry (OCR Gateway GCSE Chemistry: Combined Science)

Exam Questions

1 hour31 questions
11 mark

Look at the displayed formula of an organic compound.

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What is the name of this compound?

  • Butanoic acid

  • Butanol

  • Propanoic acid

  • Propanol

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21 mark

What is the name of the process that converts large alkane molecules into smaller alkane molecules?

  • Cracking

  • Fractional distillation

  • Hydrogenation

  • Polymerisation

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31 mark

Which displayed formula shows an alkene?

q4-paper-2-june-2018-ocr-gcse-chem

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    41 mark

    A student bubbles ethene gas into bromine water.

    What is observed?

    • Colour change from blue to colourless

    • Colour change from colourless to orange

    • Colour change from orange to colourless

    • Orange precipitate is made

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    11 mark

    Heptane is an alkane with seven carbons.

    What is the chemical formula of heptane?

    • C7H10

    • C7H12

    • C7H14

    • C7H16

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    21 mark

    The complete combustion of pentane, C5H12, takes place in the following unbalanced equation:

    _C5H12   +   _O2 →   _CO2   +  _H2O

    What numbers will balance the reaction?

    • 1,4,5,3

    • 1,8,5,6

    • 2,8,5,6

    • 2,4,5,6

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    31 mark

    Which of the following molecules is an alkene?

    • C6H10

    • C4H10

    • C5H10

    • C6H14

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    41 mark

    Which molecule can be cracked to produce hexane, C6H14?

    • C4H8

    • C4H10

    • C6H12

    • C10H22

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    51 mark

    Which of the following shows the product of the reaction between propene and bromine?

    6-2-q11-ocr-gcse-chemistry-mcq

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      61 mark

      Crude oil is a mixture of hydrocarbons.

      Crude oil is separated into useful fractions.

      Which of these mixtures of substances could be in a fraction from crude oil?

      • C2H4, C4H10, C4H10O

      • C2H4, C2H3Br, C4H10

      • C2H6, C3H8, C4H10

      • C2H6, C2H3Br, C4H10O

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      71 mark

      Crude oil is separated into useful fractions by fractional distillation.

      The diagram shows the useful fractions made in fractional distillation.

      q7-paper-2-june-2019-ocr-gcse-chem

      Which of these fractions has the weakest intermolecular forces?

      • Bitumen

      • Diesel oil

      • Gases

      • Petrol

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      81 mark

      Crude oil is separated into fractions by fractional distillation.

      Look at the diagram of the fractions made in fractional distillation.

      q7-paper-2-nov-2020-ocr-gcse-chem

      Which of these fractions has the lowest boiling point?

      • Bitumen

      • Diesel oil

      • Gases

      • Petrol

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      91 mark

      What type of reaction takes place between an alkene and hydrogen?

      • Addition

      • Dehydration

      • Neutralisation

      • Thermal decomposition

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      101 mark

      Ethene, C2H4, reacts with bromine, Br2, in an addition reaction.

      Which is the balanced symbol equation for this reaction?

      • C2H4 + Br2 → C2H3Br + HBr

      • C2H4 + Br2 → C2H4Br2

      • C2H4 + 2Br2 → C2Br4 + 2H2

      • C2H4 + 2Br2 → C2H4Br4

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      111 mark

      The bar chart shows the amount of some fractions made from 100 tonnes of crude oil by fractional distillation.

      It also shows the amount of each fraction needed for everyday uses.

      q11-paper-2-specimen-2016-ocr-gcse-chem

      Cracking converts large molecules into smaller more useful molecules to make the supply match the demand.

      Which fractions are most likely to be cracked to make the supply match the demand?

      • Gas oil and fuel oil

      • Gas oil and petrol

      • Naphtha, paraffin and fuel oil

      • Petrol and gases

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      121 mark

      What is the formula of the product in this equation?

      q10-paper-2-june-2018-ocr-gcse-chem

      • C2H2Br

      • C3Br4

      • C2H3Br

      • C2H4Br2

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      131 mark

      What is the general formula of the fractions produced by the fractional distillation of crude oil?

      • CnH2n

      • CnH2n+2

      • C2H2n+1OH

      • C2n+2H2

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      141 mark

      A student reacts a hydrocarbon with bromine water.

      The formula of the product is C3H6Br2.

      Which is the displayed formula of the hydrocarbon?

      q10-paper-4-nov-2020-ocr-gcse-chem

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        151 mark

        A student bubbles ethene gas into bromine water.

        Which displayed formula shows the product of this reaction?

        • ch2br2

        • c2h4br2

        • c2h3br

        • 1-1-c2h4br2

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        11 mark

        Crude oil is separated into fractions by fractional distillation.

        Look at the diagram of the fractions made in fractional distillation

        q3-paper-4-nov-2020-ocr-gcse-chem

        Which of these fractions has the strongest intermolecular forces?

        • Bitumen

        • Diesel oil

        • Gases

        • Kerosene

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