Chapter 7 Practice Paper: Metals and Their Reactivity — question paper

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

1. 1

   Which statement about the particles in a metal is correct?

   1. Apositive ions fixed in a sea of mobile electrons
   2. Bneutral atoms held by shared electron pairs
   3. Cmobile positive ions in a sea of fixed electrons
   4. Dalternating positive and negative ions
   ( )
2. 2

   A metal reacts with cold water but not with dilute hydrochloric acid. This is impossible because

   1. Ano metal attacks cold water
   2. Bevery water-reactive metal also displaces hydrogen from dilute acids
   3. Cdilute acids are weaker than water
   4. Dcold water is a stronger reagent than any acid
   ( )
3. 3

   Which extraction method suits calcium oxide → calcium metal?

   1. Aheating with carbon
   2. Bheating with carbon monoxide
   3. Celectrolysis of molten calcium chloride
   4. Dpanning from river gravel
   ( )
4. 4

   The slag in the blast furnace is

   1. Amolten calcium silicate floating on the iron
   2. Bmolten iron(III) oxide awaiting reduction
   3. Cthe hot air entering at the base
   4. Dthe carbon monoxide leaving at the top
   ( )
5. 5

   Magnesium ribbon and copper foil are placed in separate test-tubes of dilute sulfuric acid. The test-tube that fizzes is

   1. Athe copper, because it is denser
   2. Bthe copper, because it is lower in the series
   3. Cthe magnesium, because it is above hydrogen
   4. Dneither, since acids only attack oxides
   ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Include state symbols where the question asks, and balance every equation.

1. 1

   Experiments place an unknown metal X in the reactivity series. X does not react with cold water; X reacts with steam giving a white oxide and hydrogen; X displaces silver from silver nitrate solution.

   1. (a)

      State the region of the reactivity series X must occupy.

      [2]
   2. (b)

      Write the equation for X reacting with steam (use X as the symbol).

      [1]
   3. (c)

      Suggest whether X can be extracted by heating with carbon, with a reason.

      [2]
2. 2

   The blast furnace reduces iron(III) oxide using coke, hot air and limestone.

   1. (a)

      Write equations for: the combustion of coke; the formation of the reducing agent; the reduction of the ore.

      [3]
   2. (b)

      Explain why the furnace temperature reaches about 2000 °C near the base.

      [1]
   3. (c)

      Write the equation for the removal of silica by calcium oxide.

      [2]
3. 3

   Recycled aluminium comes from used drinks cans; recycled steel from food tins.

   1. (a)

      Explain why recycling aluminium saves so much more energy per tonne than recycling steel.

      [2]
   2. (b)

      State one way magnetic separation helps steel recycling.

      [2]
4. 4

   0.48 g of magnesium powder (Mr = 24) and 1.30 g of zinc powder (Mr = 65) react separately with excess dilute hydrochloric acid at the same temperature.

   1. (a)

      State which metal finishes reacting first, with a reason.

      [2]
   2. (b)

      Write the equation for the zinc reaction.

      [1]
   3. (c)

      Show that the two samples contain the same number of moles, and state how the two final gas syringe volumes compare.

      [2]