112_Fa10_Ex2_AA

112_Fa10_Ex2_AA - C h e m is t r y 1 1 2 N am e E xa m II F...

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Chemistry 112 Name _______________________ Exam II Form A Section _______________________ October 12, 2010 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 12, 2010 FORM A ------------------------------------------------------------------------------------------------------------ 1. What is the conjugate base of H 2 PO 4 ! ? A. H 3 PO 4 B. HPO 4 "# C. PO 4 $# D. HPO 5 $# E. H 2 O ------------------------------------------------------------------------------------------------------------ 2. Which one of the following statements is TRUE concerning the acid-base reaction below? (CH 3 ) 3 N (l) + BF 3 (l) (CH 3 ) 3 NBF 3 (s) A. (CH 3 ) 3 N is a Lewis acid and BF 3 is a Lewis base. B. (CH 3 ) 3 N is a Lewis base and BF 3 is a Lewis acid. C. Both reactants are Lewis bases. D. Both reactants are Lewis acids. E. None of these statements are true. ------------------------------------------------------------------------------------------------------------ 3. Rank the following in order of increasing acid strength (For H 2 S at 25°C, K a1 = 9.5 x 10 ! 8 , K a2 = 1.0 x 10 ! 19 ): H 2 S HS ! S 2 ! A. H 2 S < HS ! = S 2 ! B. S 2 ! = HS ! < H 2 S C. S 2 ! < HS ! = H 2 S D. H 2 S < HS ! < S 2 ! E. S 2 ! < HS ! < H 2 S ------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------ 4. Which of the following, when added to water, will INCREASE the pH at 25°C? i. KBr ii. KCN iii. FeBr 2 iv. NaClO 4 v. NH 4 Br A. i and iv. B. ii and iv.
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112_Fa10_Ex2_AA - C h e m is t r y 1 1 2 N am e E xa m II F...

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