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Chemistry · Oct / Nov 2016 · Paper 22 · Question A3

5070

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The question as text

A3 The alkanes are a homologous series of hydrocarbons.

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Show the answer and mark scheme

  • A3(a)[2]

    One mark each for any two of :

    same functional group
    (same) general formula
    similar chemical properties/react similarly
    trend in physical properties
    each differs by CH2 2

  • A3(b)[2]

    H H H H H H H │ │ │ │ │ │ │ H – C – C – C – C – H (1)

    H – C – C – C – H (1)

    │ │ │ │ │ │ │ H H H H H │ H H – C – H │ H 2

  • A3(c)(i)[2]

    One mark each for any two of:

    (generally) increases as number of carbon atoms increases
    increases in zigzag way/idea of going up irregularly/idea of going up unevenly
    decreases between C2 and C3 compound (or words to that effect) 2

  • A3(c)(ii)[1]

    any value between –25 (°C) and –45 (°C) (inclusive of these values) (1)

    1

  • A3(d)(i)[2]

    C5H12 + 8O2 → 5CO2 + 6H2O correct formulae (1)

    correct balance dependent on correct formulae (1)

    2

  • A3(d)(ii)[2]

    Any two of: carbon monoxide/carbon/water (1)

    carbon monoxide is toxic/carbon monoxide is poisonous (1)

    2 Total: 11

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