105b_2006_e2_blank bau mak

105b_2006_e2_blank bau mak - Chemistry 105b Professors Mak...

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1 Chemistry 105b Name Professors Mak & Bau Last 3 digits of SID# Spring 2006 Lab T.A.'s Name Hour Exam 2 February 23, 2006 Lab Day & Time First Letter of Family Name Question Points Score Grader 1 14 2 12 3 9 4 15 5 10 6 12 7 16 8 12 TOTAL 100 Instructions: 1. There are a total of ten (10) pages. Count the pages before you begin. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. Use only non-erasable, non-red ink. Do not use white-out. ACADEMIC INTEGRITY (Please sign below) : I certify that I have observed all the rules of ACADEMIC INTEGRITY while taking this exam. (signature)
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2 1. (14 points) A sample of S 8 gas was placed in an evacuated flask. The temperature was then raised to 1380 K where the initial pressure inside the flask was 0.587 atm. The S 8 gas was allowed to decompose according to the reaction: S 8 (g) 4 S 2 (g) When equilibrium was reached, the total pressure inside the flask was found to have increased to 2.213 atm. (a) (8 pts) Calculate the equilibrium constant K p for this reaction at 1380 K. (b) (3 pts each) If the volume of the flask is suddenly decreased after the system has come to equilibrium at 1380 K: 1. What will happen to the equilibrium (circle one)? shift right shift left unchanged 2. What will happen to the value of K p (circle one)? increase decrease unchanged
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3 2. (2 points each) When each of the following compounds is dissolved in water, indicate whether the solution will be acidic, basic or neutral. (You may use data from the table on page 9 if necessary.) Compound Acidic, Basic or Neutral (a) HNO 2 (b) SO 2 (c) NaNO 2 (d) KOH (e) Na 2 SO 4 (f) NH 4 NO 3 3. (3 points each) (For the following, you may use data from the table on page 9 if necessary.) (a) Circle the
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105b_2006_e2_blank bau mak - Chemistry 105b Professors Mak...

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