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Chemistry · Oct / Nov 2020 · Paper 42 · Question 3

0620

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Group I metals are very reactive. Transition elements are also metals but are less reactive than Group I metals.

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  • 3(a)[2]

    any two from:

    shiny / lustrous
    conduct electricity
    conduct heat

  • 3(b)[2]

    low(er) density (1)

    low(er) melting points (1)

  • 3(c)(i)[1]

    hydrogen

  • 3(c)(ii)[1]

    hydroxide / OH–

  • 3(c)(iii)[2]

    2Na + 2H2O → 2NaOH + H2

    NaOH (as a product) (1)

    rest of equation (1)

  • 3(d)(i)[1]

    galvanising

  • 3(d)(ii)[1]

    prevents water or / and oxygen reaching iron

  • 3(d)(iii)[2]

    zinc more reactive (than iron) (1)

    zinc corrodes / oxidises / reacts in preference to iron (1)

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