test1 - CHEM 2046 Test 1 Prof Veige/Martin Form A...

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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? 3. If a solution is 0.00700 M in Ca(OH) 2 , then what is the pH? 4. Which of the following is not a strong acid? 5. What is the [H 3 O + ] of a solution that has a pH of 8.50? A) 3.2x10 8 B) 3.2x10 6 C) 9.3x10 -1 D) 1.0x10 7 E) 3.2x10 -9 6. A saturated solution of an unknown acid, HA, has a pH of 5.76. What is the [OH ]? 7. At very high temperatures, H 2 O has a K w of 2.5 x 10 -12 . What is the [OH ]? 8. Consider the following reaction: HSO 4 - (aq) + CH 3 COO - (aq) SO 4 2- (aq) + CH 3 COOH (aq) Which of the following is a conjugate acid/base pair? 9. A flask is pressurized with 1 atm of N 2 gas and 1 atm of O 2 gas. The following reaction occurs: N 2 (g) + O 2 (g) 2NO (g) What is the equilibrium pressure of NO if K p is 2.5? 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
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