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Chemistry · May / June 2021 · Paper 41 · Question 6

0620

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This question is about iron.

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  • 6(a)(i)[1]

    hematite

  • 6(a)(ii)[1]

    air

  • 6(a)(iii)[1]

    slag / calcium silicate

  • 6(a)(iv)[2]

    any two from:

    (coke)

    releases heat (when it reacts with oxygen or reacts in air)

    OR (acts as a) fuel

    OR increases temperature (in the furnace) / heats (the furnace)

    OR source of energy

    (coke or carbon monoxide)

    reduces iron oxide

    OR is a reducing agent

    OR converts iron oxide to iron /

    removes oxygen from iron oxide

    (coke)

    reacts with oxygen to form carbon monoxide

    OR reacts with carbon dioxide to form carbon monoxide

  • 6(b)[1]

    S22- or S-

  • 6(c)(i)[2]

    any two from:

    (iron forms) coloured compounds
    (iron has) variable oxidation states
    (iron acts as a) catalyst

  • 6(c)(ii)[2]

    any two from:

    (iron is) good conductor of electricity
    (iron) forms a basic oxide
    (iron salts are) soluble (in water)

  • 6(d)(i)[2]

    magnesium is more reactive than iron / steel ORA (1)

    iron is not oxidised

    OR

    iron does not lose electrons

    OR

    magnesium loses electrons more easily than or in preference (to iron) ORA

    OR

    magnesium is oxidised more easily or reacts with oxygen more easily or corrodes more easily or in preference (to iron) ORA (1)

  • 6(d)(ii)[1]

    copper is less reactive than iron / copper is lower in the reactivity series than iron ORA

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