Question 1: 9 Marks (ApproximateTime Duration: What will happen if two pieces of

Question

Question 1: 9 Marks (ApproximateTime Duration: What will happen if two pieces of Zinc (Zn) and Aluminum (Al) are placed together in a solution? Which of the following reaction is correct and occurred spontaneous? Zn2Al a) Identify which reactant is reduced and which is oxidized. b) Write the two half-reactions in the above oxidation - reduction reaction. c) Balance the two half-reactions in the above oxidation - reduction reaction. d) Determine the reducing agent and the oxidizing agent in the following redox reaction

Explanation / Answer

Zn^2+ (aq) + Al(s) ------------------> Zn(s) + Al^3+ (aq)   is spontaneous reaction

a.Zn is reduced , Al is oxidised

b. Al (s) ----------------> Al^3+ (aq) + 3e^-      oxidation half reaction

   Zn^2+ (aq) + 2e^- ------------> Zn(s)           reduction half reaction

c. 2Al (s) ----------------> 2Al^3+ (aq) + 6e^-      oxidation half reaction

   3Zn^2+ (aq) + 6e^- ------------> 3Zn(s)           reduction half reaction

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2Al(s) + 3Zn^2+ (aq) --------------------> 2Al^3+ (aq) + 3Zn(s) overall net reaction

d. Al is reducing agent

    Zn^2+ is oxidizing agent.

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