14. Which of the following concentration measures will change in value as the temperature of a solution changes?
(A) mass percent
(B) mole fraction
(C)molality
(D) molarity

7. Which of the following concentration measures will change in value as the temperature of a solution changes? (A) mass percent (B) mole fraction (C) molality (D) molarity (E) all of these

15. Consider the reaction $\mathrm{2H_2 + O_2\rightarrow 2H_2O}$ What is the ratio of the initial rate of the appearance of water to the initial rate of disappearance of oxygen? (A)1:1 (B)2:1 (C)1:2 (D)3:2

16. Consider the reaction $\mathrm{X}\rightarrow \mathrm{Y} + \mathrm{Z}$ Which of the following is a possible rate law? (A)Rate=k[X] (B)Rate=k[Y] (C)Rate=k[Y][Z] (D)Rate=k[Z]

17. Which of the following is true about a system at equilibrium? (A) The concentration(s) of the reactant(s) is equal to the concentration(s) of the product(s). (B) No new product molecules are formed. (C) The concentration(s) of reactant(s) is constant over time. (D) The rate of the reverse reaction is equal to the rate of the forward reaction and both rates are equal to zero.

18. For the reaction given below, 2.00 moles of A and 3.00 moles of B are placed in a 6.00-L container. $$ \mathrm {A} (\mathrm {g}) + 2 \mathrm {B} (\mathrm {g}) \rightleftharpoons \mathrm {C} (\mathrm {g}) $$ At equilibrium, the concentration of A is $0.261\mathrm{mol / L}$ . What is the concentration of B at equilibrium? (A)0.261 mol/L (B)0.355 mol/L (C)0.500 mol/L (D)0.522 mol/L

19. For the equilibrium that exists in an aqueous solution of nitrous acid $(\mathrm{HNO}_2$ , a weak acid), the equilibrium constant expression is: (A) \(K = \frac{[\mathrm{H}^{+}][\mathrm{NO}_{2}^{-}]}{[\mathrm{HNO}_{2}]}\) (B) \(K = \frac{[\mathrm{H}^{+}][\mathrm{N}^{2+}][\mathrm{O}^{2-}]^2}{[\mathrm{HNO}_2]}\) (C) \(K = [\mathrm{H}^{+}]\mathrm{[NO}_{2}^{-}]\) (D) \(K = \frac{[\mathrm{H}^{+}]^{2}[\mathrm{NO}_{2}^{-}]}{[\mathrm{HNO}_{2}]}\)

20. Identify the strongest base. (A) $\mathrm{CH}_3\mathrm{O}^-$ (B) $\mathrm{CH}_3\mathrm{OH}$ (C) $\mathrm{CN}^{-}$ (D) $\mathrm{H}_2\mathrm{O}$

21. The correct mathematical expression for finding the molar solubility $(s)$ of $\mathrm{Sn(OH)_2}$ is: (A) $2s^{2} = K_{\mathrm{sp}}$ (B) $4s^{2} = K_{\mathrm{sp}}$ (C) $108s^{5} = K_{\mathrm{sp}}$ (D) $4s^{3} = K_{\mathrm{sp}}$

22. For which process is $\Delta S$ negative? (A)evaporation of 1 mol of \(\mathrm{CCl}_4(l)\) (B) mixing \(5\mathrm{mL}\) ethanol with \(25~\mathrm{mL}\) water (C) compressing 1 mol Ne at constant temperature from 1.5 L to 0.5 L (D) raising the temperature of \(100\mathrm{g}\) Cu from \(275\mathrm{K}\) to \(295\mathrm{K}\)

23. Which metal ion has a $d^5$ electron configuration? (A) $\mathrm{Pd}^{2+}$ (B) $\mathrm{Ag^{+}}$ (C) $\mathrm{Fe}^{3+}$ (D) $\mathrm{V}^{2+}$

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