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Chemistry · May / June 2025 · Paper 41 · Question 5

0620

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The question as text

Methanol, CH3OH, is manufactured by the reaction between hydrogen and carbon monoxide. An equilibrium mixture is produced. 2H2(g) + CO(g) CH3OH(g)

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  • 5(a)[2]

    M1 concentration is no longer changing

    M2 rates of forward reaction and of the reverse reaction are equal

  • 5(b)(i)[2]

    M1 rate decreases

    M2 yield of methanol decreases

  • 5(b)(ii)[2]

    no change(1) increases (1)

  • 5(b)(iii)[1]

    exothermic

  • 5(b)(iv)[2]

    M1 copper

    M2 transition element

  • 5(c)(i)[2]

    any 2 from:

    same or similar chemical properties or reactions
    (same) general formula
    (consecutive members) differ by CH2
    same functional group
    physical properties OR

    example of a physical property

    e.g. melting point /

    boiling point /

    volatility

    vary in predictable manner or show trends or gradually change

  • 5(c)(ii)[1]

    C5H12O

  • 5(d)(i)[2]

    M1 displayed formula of ester linkage, i.e.

    H or C

    M2 completely correct displayed formula of methyl ethanoate or ethyl methanoate

    i.e.

  • 5(d)(ii)[2]

    M1 butan-1-ol

    M2 ethanoic acid

  • 5(e)[2]

    M1 C 64.87 / 12

    H 13.51 / 1

    O 21.62 / 16

    OR

    5.41 13.51 1.35

    M2 C4H10O

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