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1 markRedox Reactions

CAPE Chemistry Unit 1 · 2006 · Paper 2 · Question 5(c)(iii)

In an experiment to determine whether iron or nickel is a better reducing agent, a strip of each metal is placed in an aqueous solution of a salt of the other metal. A reaction occurs in the container in which iron is placed in the aqueous solution of the nickel salt.

Tin shows no reaction with solutions of EITHER iron or nickel salts. Place the elements, tin, iron and nickel in order of INCREASING reducing ability.

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Other parts of this question

  1. 5(a)(i)Explain EACH of the terms 'oxidation' and 'reduction', in terms of loss and or gain of electrons[2 marks]
  2. 5(a)(ii)Explain EACH of the terms 'oxidation' and 'reduction', in terms of change in oxidation number.[2 marks]
  3. 5(b)(i)Use the appropriate half equations (from those above) to write a balanced equation to show the reaction between hydrogen peroxide and chloric (I)…[2 marks]
  4. 5(b)(ii)By making reference to the change in oxidation numbers of the elements in both the hydrogen peroxide AND the chloric (I) acid, determine which reactant is…[6 marks]
  5. 5(c)(i)State what type of chemical reaction occurs and write an ionic equation for the reaction.[3 marks]
  6. 5(c)(ii)Which element has the greater reducing ability? Explain your answer, using a suitable half equation.[4 marks]

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