Chem0120 Exam 1

Chem0120 Exam 1 - Name _ Chem 0120 Spring Term 2007...

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Name ________________________ Signature ____________________ Chem 0120 Exam I Spring Term 2007 Wednesday, February 7 INSTRUCTIONS DO NOT TEAR ANY PAGES OFF YOUR EXAM EXCEPT THE PERIODIC CHART PRINT AND SIGN YOUR NAME AT THE TOP OF THIS PAGE. The exam contains 15 multiple-choice questions (6 points each) to be answered on the machine-scored sheet, using a soft pencil. Be sure to write and code in your name (last name, space, first name) on this sheet. Do all your working on the exam sheets. *** The last 10 points will be given for your written answers to questions marked *** in the exam. USEFUL INFORMATION HA + H 2 O A - + H 3 O + , K c = K a H 2 O + H 2 O H 3 O + + OH - , K c = K w K w = 1.00 x 10 -14 pH = -log 10 [H 3 O + ] [ ] = Molar concentration M = mol/L For ax 2 + bx + c = 0, x = - ± - b b ac a 2 4 2 > means: is greater than; < means: is less than For a strong acid, K a is not defined For a weak acid, K a has a value For an ion with no acidic properties, K a = 0 **A Periodic Chart is attached ** Get to work on your B-I-K-E! GOOD LUCK
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1. Which one of the following is a correct equation for the Brønsted-Lowry reaction of potassium nitrite, KNO 2 , with the strong acid, HBr? a) KNO 2 (aq) + HBr(aq) KBr(s) + NO(g) + OH - (aq) b) NO 2 - (aq) + HBr(aq) HNO 2 Br(aq) c) KNO 2 - (aq) + H 3 O + (aq) HNO 2 (aq) + KOH(aq) d) NO 2 - (aq) + H 3 O + (aq) HNO 2 (aq) + H 2 O(l) e) K + (aq) + Br - (aq) KBr(aq) 2. Consider a 0.250L sample of a 0.500M solution of CaCl 2 . Determine: (i) The number of moles of CaCl 2 in the sample (ii) The molarity of Cl - ions in the solution *** Show your work (i) moles CaCl 2 (ii) molarity of Cl - a) 0.500 mol 1.00M b) 0.500 mol 0.250M c) 0.500 mol 4.00M d) 2.00 mol 0.250M e) 2.00 mol 1.00M f) 2.00 mol 4.00M g) 0.125 mol 0.500M h) 0.125 mol 1.00M i) 0.125 mol 0.250M 3. Which one statement concerning the K value of a reaction is not correct ? a) K is called the equilibrium constant of the reaction
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This note was uploaded on 04/13/2008 for the course CHEM 0120 taught by Professor Golde during the Spring '07 term at Pittsburgh.

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Chem0120 Exam 1 - Name _ Chem 0120 Spring Term 2007...

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