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Chemistry · May / June 2025 · Paper 41 · Question 3

0620

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This question is about copper and compounds of copper.

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  • 3(a)(i)[3]

    M1 positive ions / cations(1)

    M2 sea of electrons /

    mobile electrons /

    delocalised electrons(1)

    M3 attraction between positive ions and electrons(1)

  • 3(a)(ii)[1]

    electrons move /

    electrons mobile /

    electrons flow

  • 3(b)(i)[1]

    harder or stronger

  • 3(b)(ii)[1]

    zinc

  • 3(c)(i)[2]

    Any two from:-

    solid disappears / solid dissolves
    fizzing / bubbling / effervescence
    blue solution

  • 3(c)(ii)[1]

    all the sulfuric acid had reacted

  • 3(c)(iii)[1]

    copper(II) carbonate

  • 3(c)(iv)[1]

    copper(II) oxide / copper(II) hydroxide

  • 3(c)(v)[1]

    saturated (solution)

  • 3(c)(vi)[2]

    M1 more particles per unit volume

    M2 more collisions per unit time / increased collision frequency

  • 3(c)(vii)[1]

    hydrated

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