The following statements refer to the reaction described in problem #1. Indicate

Question

The following statements refer to the reaction described in problem #1. Indicate whether the statement is TRUE or FALSE by placing a T or F in the space provided. If the statements is false, CORRECT IT. A. Aluminum is oxidized in this reaction since it loses electrons. B. This reaction occurs spontaneously. C. The electrons flow from the anode to the cathode in this voltaic cell. D. Zn^2+ is the reducing agent in this reaction E. A spontaneous cell reaction has a (-) E_cell degree value and a (+) Delt a G degree value. F. The mass of the Zn electrode increases during this redox reaction. Use the attached Table of Standard Electrode Potentials to arrange the following oxidizing agents in order of increasing strength. AI^3+ (aq), Ca^2+ (aq), CI_2 (g), NO_3^-1 (aq) When crystals of barium hydroxide. Ba(OH)_2 8H_2 O, are mixed with crystals of ammonium thiocyanate. NH_4 SCN, at room temperature in an open beaker, the mixture liquefies, the temperature drops dramatically and the odor of ammonia. NH_3, is detected The reaction occurs as follows: Ba(OH)_2 8H_2 O(s) + 2 NH_4 SCN_(s) rightarrow Ba^2+ (aq) + 2 SCN^-1 (aq) + 2 NH_3 (g) + 10 H_2 O (I) A. Using the description of this reaction, predict whether Delta H for this reaction is (+), (-) or neither. Explain your prediction. B. How does the entropy (S) of the system change (uparrow, downarrow or stay the same) ? Explain.

Explanation / Answer

3) Higher is the reduction potential easily it gets reduced and act as a better oxidising agent. The standard reduction ptential of Al3+(-1.66V), Ca2+ (-2.87V), Cl2(+1.36V), NO3-(0.957V).

Thus the proper order of oxidising agent in increasing order is,

Ca2+ (-2.87V) < Al3+(-1.66V) < NO3-(0.957V) < Cl2(+1.36V)

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