prog43 - A1 CHM 2047 Name BONUS 2 UF ID Dec 1 2004 Answer...

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A1 CHM 2047 BONUS 2 Dec. 1, 2004 Name UF ID Answer the following questions by circling the correct answer, or supplying the requested information. There are twelve questions on this exam, with point values as noted. This exam is worth a total of 100 points, with 116 points earnable. 1. (7 points) The pH of 0.25 M NH 3 is closest to (1) - 2 . 65 (2) - 4 . 92 (3) 11 . 32 (4) 9 . 07 (5) 11 . 63. 2. (7 points) Consider 0.1 M NH 4 HS. This solution is (1) mildly basic (2) strongly basic (3) neutral (4) strongly acidic (5) mildly acidic. 3. (7 points) In a saturated solution of CaCO 3 in 1 M NH 4 Cl, the principal equilibrium is (1) CaCO 3 (s) * ) Ca 2+ (aq) + CO 3 2 - (aq) (2) NH 4 + (aq) + H 2 O(l) * ) NH 3 (aq) + H 3 O + (aq) (3) NH 4 Cl(aq) * ) NH 4 + (aq) + Cl - (aq) (4) CaCO 3 (s) + NH 4 + (aq) * ) Ca 2+ (aq) + NH 3 (aq) + HCO 3 - (aq) (5) NH 4 + (aq) + HCO 3 - (aq) * ) NH 3 (aq) + “H 2 CO 3 ”(aq). 4. (7 points) For the reaction, CH 4 (g) + H 2 O(g) * ) CO(g) + 3 H 2 (g), adding an inert gas (He, for example) at constant pressure results in (1) an increase in the value of K (2) an increase in the amount of H 2 O(g) (3) heterogeneous catalysis (4) an increase in the amount of CO(g) (5) no change in the equilibrium.
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