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Department
Chemistry
Course
CHM 2046
Professor
Christou
Semester
Spring

Description
CHEM 2046 Test 1 Prof. Veige/Martin Form A_______________________ Instructions: Mark only one answer on the scantron. Be sure to erase any mistaken answers fully. You have 2 hours to complete the test. Turn in all sheets of paper used during the test. Any suspicious activity during the test will be considered cheating and will result in an automatic zero. Verification of identity by a valid UF id is required before your test will be accepted. 1. Which best describes NH ? 3 A) polyprotic base B) strong electrolyte C) weak base D) an amphiprotic species E) conjugate acid of a weak base 2. Which of the following can act as a Brønsted-Lowry acid in water? A) [Fe(H O) ] 3+ B) CH COO − C) NH D) Na C O E) None of the above 2 6 3 3 2 2 4 3. If a solution is 0.00700 M in Ca(OH) , 2hen what is the pH? A) 0.602 B) 12.8 C) 1.15 D) 12.1 E) -2.15 4. Which of the following is not a strong acid? A) Citric acid B) HI C) HBr D) HNO 3 E) HClO 4 5. What is the [H O ] of a solution that has a pH of 8.50? 8 3 6 -1 7 -9 A) 3.2x10 B) 3.2x10 C) 9.3x10 D) 1.0x10 E) 3.2x10 − 6. A satu-6ted solution of a-9unknown acid, HA,-6as a pH of 5.76. -4at is the [OH ]? -4 A) 3.5x10 M B) 5.8x10 M C) 1.7x10 M D) 7.2x10 M E) 8.3x10 M -12 − 7. At ver-7high temperatures-6H O 2as a K of w.-12 10 . What is the-6OH ]? -6 A) 1.0x10 M B) 5.0x10 M C) 1.3x10 M D) 1.6x10 M E) 2.5x10 M 8. Consider the following reaction: - - 2- HSO (a4) + CH COO 3aq) SO 4 (aq) + CH C3OH (aq) Which of the following is a conjugate acid/base pair? A) HSO /CH COOH B) HSO /CH COO − C) HSO / SO 2− 4 − 3 2− 4 3 4 4 D) CH CO3 /SO 4 E) Both A and B are correct 9. A flask is pressurized with 1 atm of N gas and 1 atm of O gas. The following reaction occurs: 2 2 N 2g) + O (g2 2NO (g) What is the equilibrium pressure of NO if K isp2.5? Answer is .88 atm. Everybody gets credit for this one. 10. Compound AB dissociates in water in the following manner: + - AB (aq) A (aq) + B (aq) + − In a 1 L flask at equilibrium [AB] = 0.25 M and [A ] = [B ] = 2.0 M. What is the new equilibrium [AB] after adding 2.0 mol of B ?− A) 0.18 M B) 0.070 M C) 0.43 M D) 0.60 M E) 0.53 M 11. K is 1.8x10 at 26.85 C for the following reaction: p 2A (g) + 3B (g) C (g) + 2 D (g) Determine K . c = 0.08206 Latmmol K . -1.-1 -8 -5 -7 -5 -11 A) 1.8x10 B) 1.1x10 C) 4.4x10 D) 2.2x10 E) 3.0x10 12. K is 2.8 at 900 K for the following reaction: c A (s) + 2B (g) 2C (g) What is K ? p -1 -1 A) K p K (Rc) B) K c K (pT) C) K c K p D) K c K (Rp) E) K =pK (Rc) 13. Consider the reaction below where K is c.465x10 : 5 2C 2 (6) + 7O (g)2 4CO (2) + 6H O 2g) 5x10 mols of C H 2 36mols of O , 4 2ols of CO and 22mols of water are added to a 5.00 L vessel. Calculate Q cnd then determine in which direction the reaction will proceed. 5 A) Q =c5.330x10 , t10 reaction will proceed left. B) Q =c5.990x10 , the reaction will proceed left. C) Q =c2.990x10 , the reaction will proceed left. 4 D) Q =c5.990x10 , t5e reaction will proceed right. E) Q =c3.465x10 , the reaction is at equilibrium. 0 14. Consider the following reaction for which ΔH rxn< 0: A (s) + B (g) C (s) Which of the following statements is correct? I Adding A shifts the reaction right. II Increasing the volume shifts the reaction left. III Decreasing the temperature shifts the reaction right. A) I, II, III B) I C) I, II D) II, III E) III 15. Which of the following are Brønsted acids? I NO − II CH NH + III CN − IV H SO V NaOH 3 3 3 2 4 A) I, II, III, IV B) II, IV C) I, III, V D) I, V E) III, IV 16. The following reaction is at equilibrium: C (s) + H 2 (g) CO (g) + H (2) What is the effect of adding H 2 (g) to the system above? A) The product concentrations increase B) The product concentrations decrease C) More C(s) is produced D) K will decrease E) No change 17. The following reaction is at equilibrium: 2NOBr (g) 2NO (g) + Br (g) o 2 If H = +82.1 kJ/mol, what effect does increasing the temperature have on the reaction? A) The product concentrations increase B) The product concentrations decrease C) No effect D) The reactant concentration decreases E) Both A and D are correct 18. The following reaction is at equilibrium: 2N 2g) + 4H O 2l) 4NO (g) + 4H (g2 What will be the effect of removing some water from the system? A) The product concentrations increase B) The product concentrations decrease C) No effect D) The number of moles of H (g)2increase E) Both A and D are correct 19. The following reaction is at equilibrium: 2N (g) + 4H O (g) 4NO (g) + 4H (g) 2 2 2 What effect does increasing the pressure have on the system? A) The product concentrations increase B) The product concentrations decrease C) No effect D) The reactant concentrations decrease E) Both A and D are correct 20. The following reacion is the sum of 3 other reactions: Os (s) + 2Cl 2g) OsCl 4s) K rxn= 50,000 Here are 2 of the other reactions: H O (g) + CO (g) H (g) + CO (g) K = 1,000 2 2 2 1 OsO (s) + H (2) + 2Cl (g2 OsCl 4s) + H O2(g) K 2 500 Which of the following is the third reaction? A) Os (s) + CO (g) Os(CO ) (g) K = 1 2 2 3 B) Os (s) + H (2) + CO (g)2 OsO (s) + H O2(g) + C (s) K = 031 C) Os (s) + CO (g2 OsO (s) + CO (g) K 3 1 D) OsO (s) + CO (g) Os (s) + CO (g) K = 1 2
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