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Practice Exam 3

Practice Exam 3 - Chemistry 105 B Practice Exam 3 Dr...

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1 Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Practice Exam 3 Name: __________________________________ Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TA’s Name: _________________________________ Question Points Score Grader 1 18 2 14 3 10 4 20 5 10 6 10 7 8 8 10 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 8 problems on 11 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
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2 1. (18 pt) Answer the following multiple choice questions. i. For which process is Δ S sys negative? a. evaporation of 1 mol of liquid CCl 4 b. mixing 5 mL of ethanol with 25 mL of water c. freezing of liquid benzene to solid benzene d. raising the temperature of 100 g of He from 245 K to 295 K e. grinding a large crystal of KCl to powder ii. A chemical reaction will be spontaneous at all temperatures if it is accompanied by: a. increasing enthalpy and increasing entropy b. decreasing enthalpy and increasing entropy c. increasing enthalpy and decreasing entropy d. decreasing enthalpy and decreasing entropy iii. The second law of thermodynamics states that: a. the entropy of a perfect crystal is zero at 0 K b. the entropy of the universe is constant c. the energy of the universe is increasing d. the entropy of the universe is increasing e. the energy of the universe if constant iv. Which of the following processes decreases the atomic number by 1?
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