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Chemistry · Oct / Nov 2024 · Paper 41 · Question 3

0620

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The question as text

Copper(II) sulfate has the formula CuSO4. Aqueous copper(II) sulfate is a blue solution. A sample of aqueous copper(II) sulfate is made by adding excess copper(II) oxide, CuO, to hot dilute sulfuric acid, H2SO4.

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  • 3(a)[2]

    M1 H2O

    M2 state symbols: (s) (aq) (aq)

  • 3(b)[1]

    no more solid dissolves

  • 3(c)[1]

    filtration

  • 3(d)(i)[1]

    substance that is chemically combined with water

  • 3(d)(ii)[1]

    CuSO4

    5H2O

  • 3(d)(iii)[2]

    M1 heat

    M2 until saturation (point) AND allow to cool

  • 3(e)(i)[1]

    mobile ions

  • 3(e)(ii)[2]

    M1 conducts electricity

    M2 inert

  • 3(e)(iii)[1]

    becomes lighter (blue)

  • 3(e)(iv)[1]

    pink AND solid

  • 3(e)(v)[3]

    4OH– → 2H2O + O2 + 4e–

    M1 O2 as a product

    M2 OH– AND e–

    M3 correct equation

  • 3(e)(vi)[2]

    one mark each for any two of:

    colour remains constant
    no bubbles at the anode
    anode dissolves
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