ࡱ> bdaq` SbjbjqPqP .Z::H4*dddd? ? ? )))))))$r-h/)i#? ? ##)dd>*?)?)?)#dd)?)#)?)?)?)d|   !&J?))T*0*?)0k(0?)0?)p? A!?)!"? ? ? ))))? ? ? *####@d @ EXAM 2 PRACTICE MULTIPLE CHOICE QUESTIONS ANSWER KEY 1. For the following system at equilibrium, what will cause the partial pressure of HF to increase? UO2(s) + 4 HF(g) UF4(g) + 2 H2O(g) a. adding UO2(s) c. adding UF4(g) b. decreasing the volume d. removing H2O(g) 2. Which of the following is a strong acid? a. HF b. H3PO4 c. HCl d. H2CO3 3. The following are strong bases EXCEPT a. LiOH b. Al(OH)3 c. KOH d. Ba(OH)2 4. For the following reaction, which of the following is a conjugate acid-base pair? HC2O4-(aq) + H2O(l) H3O+(aq) + C2O42(aq) a. HC2O4 and H2O c. H2O and C2O42 b. HC2O4 and H3O+ d. HC2O4 and C2O42 5. Which of the following is true of the following system? CH3NH3+(aq) + OH-(aq) CH3NH2(aq) + H2O(l) a. Equilibrium lies to the left, because H2O is a stronger acid than CH3NH3+ b. Equilibrium lies to the left, because OH- is a stronger base than CH3NH2 c. Equilibrium lies to the right, because CH3NH3+ is a stronger acid than H2O d. Equilibrium lies to the right, because OH- is a stronger acid than H2O 6. In the following reaction, which is a Brnsted-Lowry base? HC2O4(aq) + H2O(l) H3O+(aq) + C2O42(aq) a. HC2O4 b. H2O c. H3O+ d. None of these 7. When KNO2 is dissolved in water, which of the following is the principal acid-base equilibrium? a) K(H2O)6+(aq) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT K(H2O)5OH(aq) + H+(aq) b) HNO2(aq) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT H+ (aq) + NO2- (aq) c) NO2- (aq) + H2O(l) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT HNO2(aq) + OH- (aq) d) NO2- (aq) + H2O(l) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT HNO3(aq) + H+ (aq) 8. Consider the following reaction at equilibrium. 2 CO2 (g) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT 2 CO (g) + O2 (g) "H0 = 514 kJ/mol Le Chtelier s principle predicts that adding O2 (g) to the reaction container will a) increase the partial pressure of CO2 (g) at equilibrium. b) increase the partial pressure of CO (g) at equilibrium. c) increase the value of the equilibrium constant. d) decrease the value of the equilibrium constant. 9. A Brnsted-Lowry base is defined as a substance that a) acts as a proton donor. b) increases [H+] when placed in water. c) acts as a proton acceptor. d) decreases [H+] when placed in water. 10. For the following reaction, which of the following is a conjugate acid-base pair? H2PO4- (aq) + NH3 (aq) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT HPO42- (aq) + NH4+ (aq) a) H2PO4- and NH3 b) HPO42- and NH4+ c) H2PO4- and HPO42- d) None of the above 11. The equilibrium constant for the gas phase reaction 2 NH3 (g) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT N2 (g) + 3 H2 (g) is Keq = 230 at 300 C. Which one of the following statements is true at equilibrium? a) The reactant predominates. b) The products predominate. c) Only products are present. d) Only the reactant is present. 12. Which of the following reactions corresponds to hydrolysis of NH4+ in water solution? a. NH4+(aq) + OH (aq) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT NH3(aq) + H2O(l) b. NH4+ (aq) + H2O(l) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT NH3(aq) + H3O+(aq) c. NH4+ (aq) + H2O(l) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT NH52+(aq) + OH(aq) d. NH4+ (aq) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT  NH2+(aq) + H2(g) 13. Which of the following is true? a. HF is a stronger acid than HI, because F is more electronegative than I. b. HF is a stronger acid than HI, because the HF bond is weaker than the HI bond. c. HF is a weaker acid than HI, because I is more electronegative than F. d. HF is a weaker acid than HI, because the HF bond is stronger than the HI bond. 14. Which one of the following would be expected to change the value of the equilibrium constant? a) adding reactant b) adding product c) adding a catalyst d) changing the temperature e) decreasing the reaction vessel volume 15. Consider the following reaction at equilibrium in a closed container 4 NH3(g) + 3 O2(g) INCLUDEPICTURE "Q%20lechatelier%20problems_files/equilibrium_arrow.gif" \* MERGEFORMAT  2 N2(g) + 6 H2O(g) "H =  64.5 kJ/mol i. Increasing the O2 partial pressure will __________ the NH3 partial pressure. a) increase b) decrease c) not change ii. Increasing the temperature of the reaction vessel will __________ the NH3 partial pressure. a) increase b) decrease c) not change iii. Decreasing the volume of the reaction vessel will __________ the NH3 partial pressure. a) increase b) decrease c) not change 16. What is the conjugate base of HCO3? a) OH b) H2CO3 c) CO32 d) HCO3+ e) H3CO3+ 17. What is the pH of an aqueous solution at 25.0oC in which [OH] is 0.00250 M. a) +2.60 b) 2.60 c) +11.4 d) 11.4 e) 2.25 18. A Brnsted-Lowry acid is defined as a substance that ______ . a) decreases [H3O+8 K L N Q W ] ^ ` d          ! 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