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Unformatted text preview: 1 Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Practice Exam 2 Name: __________________________________ Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TAs Name: _________________________________ Question Points Score Grader 1 10 2 10 3 4 4 6 5 21 6 10 7 10 8 15 9 14 Total 100 Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature: _______________________________________________________________ Instructions: 1. You must show work to receive credit. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST use black or blue ink. (No pencil, no whiteout, no erasable ink.) 4. There are 9 problems on 9 pages. Please count them before you begin. A periodic table and some useful equations can be found on the last page. 5. Good luck!! =) First Letter of last Name 2 1. (10 pt) Determine if the following statements are true or false. If false correct the statement. a. When covalent oxides are dissolved in water basic solutions result. True or False b. When hydroxide ions are added to a solution buffered with ammonia molecules and ammonium ions, the ammonia concentration will increase and the ammonium concentration will decrease. True or False c. Strong acid can be used to change acetic acid molecules to acetate ions. True or False d. pH + pOH = 14 at all temperatures. True or False e. K a K b = K w at all temperatures. True or False 2. (10 pt) Will solutions of the following salts be acidic, basic or neutral? If necessary refer to the table of K a and K b values on the last page....
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- Summer '04