Exam-style Questions: Metals - The Reactivity Series

  1. a) What would you expect to see if zinc metal was placed in to copper sulphate solution?

    (2 marks)

    b) What are the products formed in this reaction?

    (2 marks)

    (Marks available: 4)

    Answer

    Answer outline and marking scheme for question: 1

    a) Grey metal turns brown/brown metal displaced.

    (1 mark)

    Blue solution turns colourless.

    (1 mark)

    b) Copper.

    (1 mark)

    Zinc sulphate.

    (1 mark)

    (Total = 4 marks)

  2. Complete the following equations to show what happens when metals are heated with oxides of other metals.

    a) magnesium + copper oxide =

    (1 mark)

    b) lead + tin oxide =

    (1 mark)

    c) Fe2O3(s) + 3Zn(s) =

    (2 marks)

    (Marks available: 4)

    Answer

    Answer outline and marking scheme for question: 2

    a) magnesium oxide + copper

    (1 mark)

    b) No reaction.

    (1 mark)

    c) 3ZnO(s) + 2Fe(s)

    (1 mark for formula, 1 mark for balanced equation)

    (Total = 4 marks)

  3. When iron oxide is heated with aluminium powder, the following reaction takes place:

    Aluminium + iron oxide → iron + aluminium oxide

    When aluminium oxide is heated with iron no reaction takes place.

    a) Which of the two metals is more reactive?

    (1 mark)

    b) The formula for iron oxide is Fe2O3. The formula for aluminium oxide is Al2O3.

    Write a balanced symbol equation to show the reaction between aluminium and iron oxide.

    (1 mark)

    c) Window frames made from aluminium do not corrode as quickly as windows made form iron.

    Explain this statement using the information above.

    (2 marks)

    (Marks available: 4)

    Answer

    Answer outline and marking scheme for question: 3

    a) Aluminium

    (1 mark)

    b) 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s)

    (1 mark)

    c) Aluminium should corrode faster than iron because it is more reactive,

    (1 mark)

    It does not because the aluminium reacts with oxygen in the air to form a layer of oxide, which protects the aluminium.

    (1 mark)

    (Total = 4 marks)

    (When iron oxide forms, it flakes off exposing fresh iron underneath).