112_Fa11_Ex2-B2 - C h e m is t r y 1 1 2 N am e E xa m II F...

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Name _______________________ Exam II Form B Section _______________________ October 11, 2011 eMail _______________________ IMPORTANT : On the scantron (answer sheet), you MUST clearly fill your name , your student number , section number , and test form (white cover = test form A; yellow cover = test form B). Use a #2 pencil. There are 25 questions on this exam. Check that you have done all of the problems and filled in the first 25 bubbles on the scantron. The maximum score on this exam is 25 points. Your score will be reported in percent (max 100%). Exam policy Calculators with text-programmable memory are not allowed. Relevant data and formulas, including the periodic table, are attached at the end of this exam. Your grade will be based only on what is on the scantron form. The answer key will be posted on the web after the exam (on the Exam Schedule page). You must turn in your cover sheet with your scantron answer form. Hints As you read the question, underline or circle key words to highlight them for yourself. Avoid errors from "mis-reading" the question. Pay attention to units and magnitudes (decimal places) of numbers obtained from calculations. There is no penalty for guessing. CHEMISTRY 112 EXAM 2 OCTOBER 11, 2011 FORM B ------------------------------------------------------------------------------------------------------------ 1. Which equilibrium below corresponds to the base dissociation constant (K b ) for NO 2 ! ? A. HNO 2 (aq) H + (aq) + NO 2 ! (aq) B. NO 2 ! (aq) + H + (aq) HNO 2 (aq) C. NO 2 ! (aq) + OH (aq) HNO 3 (aq) D. HNO 2 (aq) + OH (aq) NO 2 ! (aq) + H 2 O( ! ) E. NO 2 ! (aq) + H 2 O( ! ) HNO 2 (aq) + OH (aq) ------------------------------------------------------------------------------------------------------------ 2. What is the H + concentration in an HF solution with a pH of 3.75? A. 5.6 x 10 3 B. 7.5 x 10 ! 3 C. 3.0 x 10 ! 11 D. 1.8 x 10 ! 4 E. 2.5 x 10 ! 8 ------------------------------------------------------------------------------------------------------------ 3. Which of the following is/are true statement(s): I. In polyprotic acids, K a always decreases with each ionization. II. Weak acids have weak conjugate bases. III. Pickles (2.4 M NaCl) conduct electricity better than cucumbers (5.2 ! 10 ! 6 M NaCl). A. I only B. I and II only C. I and III only D. II and III only E. I, II and III ------------------------------------------------------------------------------------------------------------ 4. What is the conjugate acid of HPO 4 2 ! ? A. H
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This note was uploaded on 12/20/2011 for the course CHEM 112 taught by Professor Vandersluys,lorschmid,kylem during the Fall '07 term at Penn State.

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112_Fa11_Ex2-B2 - C h e m is t r y 1 1 2 N am e E xa m II F...

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