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Chemistry · May / June 2021 · Paper 41 · Question 3

0620

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The question as text

Potassium reacts with chlorine to form potassium chloride, KCl.

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  • 3(a)[2]

    2K + Cl2 → 2KCl

    Cl2 on left hand side (1)

    equation fully correct (1)

  • 3(b)[3]

    K outer shell with 8 crosses (1)

    Cl outer shell with 7 dots and 1 cross (1)

    + and – (1)

  • 3(c)(i)[2]

    breakdown by (the passage of) electricity (1)

    of an ionic compound in molten or aqueous (state) (1)

  • 3(c)(ii)[2]

    (anode) chlorine

    (cathode)potassium

  • 3(d)(i)[2]

    2H+ + 2e(–) → H2

    H+ and e(–) on left hand side (1)

    equation fully correct (1)

  • 3(d)(ii)[1]

    chlorine

  • 3(d)(iii)[1]

    potassium hydroxide (1)

  • 3(e)[1]

    one shared pair of electrons and 6 non-bonding electrons on each chlorine atom

  • 3(f)(i)[2]

    liquid (1)

    BOTH melting point is below –75 oC AND boiling point is above –75 oC

    OR

    BOTH –75 oC is higher than –101 oC / melting point AND lower than –35 oC / boiling point

    OR

    –75 oC is between melting point or –101 oC and boiling point or –35 oC

  • 3(f)(ii)[3]

    ionic bonds in KCl (1)

    attraction between molecules in Cl2 (1)

    weaker attraction (between particles) in Cl2 ORA (1)

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