Exam 1 - Spring 2006

Exam 1 - Spring 2006 - Name Chem 0120 Golde Spring Term...

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Name ________________________ Signature ____________________ Chem 0120 - Golde Exam I Spring Term 2006 Wednesday, February 8 INSTRUCTIONS DO NOT TEAR ANY PAGES OFF YOUR EXAM 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 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. An answer key will be available in Room 101 after the exam (about 12 noon). The answer key will also be posted on the Blackboard CourseWeb site. 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 **A Periodic Chart is attached ** Get to work on your B-I-K-E! **5 fingers maketh a rule GOOD LUCK Some weak acids : Formic acid, HCHO 2 K a = 1.70 x 10 -4 Acetic acid, CH 3 COOH K a = 1.75 x 10 -5 Hydrofluoric acid, HF K a = 6.8 x 10 -4 A weak base Ammonia, NH 3 K b = 1.75 x 10 -5
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1. All of the following species are soluble in water. Find all those which split completely into ions, when they dissolve in water. HNO 2 HI KNO 2 NH 3 BaI 2 a) BaI 2 only b) NH 3 only c) KNO 2 and BaI 2 d) HNO 2 and HI e) HI, KNO 2 and BaI 2 f) All of them 2. 50.0 mL of 0.100 M LiBr solution was mixed with 50.0 mL of 0.200 M LiNO 3 solution to create a solution of total volume 100.0 mL. Determine the molar concentration of Li + ions in the final solution. *** Show your work a) 0.050 M b) 0.100 M c) 0.150 M d) 0.200 M e) 0.250 M f) 0.300 M g) 0.400 M h) 0.500 M
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3. Consider the reversible reaction: N 2 (g) + 3 H 2 (g) 2 NH 3 (g) This reaction is allowed to reach a state of equilibrium at a given temperature. Which of the following statements is/are completely correct? 1. At equilibrium, the limiting reagent, N
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This note was uploaded on 04/06/2009 for the course CHEM 120 taught by Professor Dr.wagner during the Spring '07 term at Pittsburgh.

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Exam 1 - Spring 2006 - Name Chem 0120 Golde Spring Term...

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