Test 2 #2 - Page 3 of 16 You are writing VERSION 1 of this...

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Page 3 of 16 Continued on next page… You are writing VERSION 1 of this test. Make sure you have correctly entered your version number (“1”) in the correct column on your scan sheet (see p. 2 for details). Questions 1 through 15 are worth two (2) marks each. 1. In the absence of acid, barium fluoride dissolves in water according to the equation: BaF 2 (s) Ba 2+ (aq) + 2 F - (aq) K c = 1.7 × 10 - 6 The solubility of barium fluoride is affected by the acid-base chemistry of the fluoride ion. The acid dissociation constant, K a , of HF is 7.1 × 10 - 4 . Find the equilibrium constant, K c , for the overall reaction, BaF 2 (s) + 2 H + (aq) Ba 2+ (aq) + 2 HF(aq) K c = ? (A) 8.6 × 10 - 13 (B) 1.2 × 10 - 9 (C) 1.4 × 10 - 3 (D) 2.4 × 10 - 3 (E) 3.4 2. Equal volumes of 0.00400 M FeCl 3 (aq) and 0.00100 M of KSCN(aq) were mixed. The following reaction occurs at 25 ºC: Fe 3+ (aq) + SCN - (aq) FeSCN 2+ (aq) K c = 180. The equilibrium concentration of FeSCN 2+ (aq) is equal to 1.26 × 10 - 4 M. What is the equilibrium concentration of Fe 3+ (aq)? (A) 4.00 × 10 - 3 M (B) 3.87 × 10 - 3 M (C) 1.87 × 10 - 3 M (D) 3.75 × 10 - 4 M (E) 2.13 × 10 - 4 M
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Page 4 of 16 Continued on next page… 3. For the equilibrium reaction shown below: 2 NH 3 (g) N 2 (g) + 3 H 2 (g) H ° = - 91.8 kJ Which one of the following changes will cause the equilibrium to shift to the RIGHT ( i.e ., towards products)? (A) Adding a catalyst. (B) Increasing the temperature. (C) Adding Ne(g) to the reaction. (D) Increasing the concentration of NH 3 (g). (E) Reducing the volume of the reaction vessel. 4. For the equilibrium reaction shown below: 4 NH 3 (g) + 5 O 2 (g) 4 NO(g) + 6 H 2 O(g) Choose the statements that are TRUE : (i) Addition of NO(g) shifts the equilibrium to the left. (ii) Addition of H 2 O(g) has no effect on the equilibrium. (iii) Addition of HCl(g) shifts the equilibrium to the left. (iv)
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Test 2 #2 - Page 3 of 16 You are writing VERSION 1 of this...

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