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Chemistry · Oct / Nov 2024 · Paper 41 · Question 5

0620

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Hydrogen is the zrst element of the Periodic Table.

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  • 5(a)(i)[1]

    oxygen

  • 5(a)(ii)[2]

    advantage: any one of:

    water is the only product
    no carbon dioxide produced
    more efficient

    disadvantage: any one of:

    hydrogen needs to be stored at high pressure
    hydrogen hard to store
    heavy tanks needed to store hydrogen
    fewer (hydrogen) filling stations
    less efficient

  • 5(b)(i)[1]

    fractional distillation

  • 5(b)(ii)[1]

    cracking

  • 5(c)[4]

    M1 Mr of CH3CH2COOCH3 = 88

    M2 mol of CH3CH2COOCH3 = 44 / 88 = 0.5

    M3 mol of H = 0.5 × 8 = 4.0

    M4 no of H atoms = 4.0 × 6.02 × 1023 = 2.408 × 1024

  • 5(d)[4]

    M1 ethane

    M2 propene

    M3 ethanol

    M4 propanoic acid

  • 5(e)(i)[1]

    contain carbon and hydrogen atoms only

  • 5(e)(ii)[1]

    they have a carbon-carbon double bond

  • 5(e)(iii)[1]

    nickel

  • 5(e)(iv)[1]

    only one product is formed

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