exam key - 1 CHEMISTRY 102 FINAL EXAM- KEY THURSDAY MAY 5,...

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CHEMISTRY 102 FINAL EXAM- KEY THURSDAY MAY 5, 2006 (8:00 a.m. – 10.50 a.m.) 51 Questions at 4 points each ANSWER KEY (FINAL VERSION, without worked solutions) The following are needed and must be added. (1) Periodic table with values of fundamental constants This is the final version, checked Tuesday May 2, 2006 1
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1. When the partial pressure of nitrogen in air is 0.78 atm., the equilibrium concentration of nitrogen in water is 5.3 x 10 -4 M. What partial pressure of nitrogen (in atm) is required to produce a concentration of 1.1 x 10 -3 M in water at the same temperature? A 0.63 B 0.78 C 1.0 D 2.1 2. A solution containing 10.0 g of a non-ionic compound in 90.0 g water has a freezing point of –3.33HC. Given that K f = 1.86HC/m for water, what is the molecular mass of the compound? A 69.0 B 62.1 C 333 D 619 E 161 3. A 4.00 g sample of a protein was dissolved in water and the volume of the aqueous solution adjusted to 100.00 mL. The osmotic pressure of this solution was 10.68 torr at 25HC. What is the molecular mass of the protein? A 6.96 x 10 4 B 5.29 x 10 7 C 2.34 x 10 5 D 1.27 x 10 5 E 3.46 x 10 5 4. It takes 222 minutes for the concentration of A to decrease from 0.16 M to 0.08 M in the second-order reaction 2A B. How many minutes does it take for the concentration to decrease from 0.04 M to 0.02 M? A 55.5 B 111 C 222 D 444 E 888 2
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5. The reaction A + 2B + 3C X + Y is followed by the “method of initial rates” yielding the following results: Experiment Initial [A] Initial [B] Initial [C] Initial rate (M/s) 1 0.1000 0.1000 0.1000 1.1 x 10 -3 2 0.1000 0.1000 0.2000 4.4 x 10 -3 3 0.2000 0.1000 0.2000 4.4 x 10 -3 4 0.2000 0.2000 0.2000 8.8 x 10 -3 What is the “rate law” for this reaction? A k[A][B] 2 [C] 3 B k[A][B][C] 2 C k[A][C] 2 D k[B][C] 2 E k[A] 2 [B][C] 2 6. Which of the following statements is not true? A The rate of any reaction increases with temperature B A catalyst increases the rate of the reverse reaction C The highest point in any reaction profile indicates the “activation energy” for the reaction D A catalyst participates in the reaction process E A catalyst increases the yield of products 7. Which of the following reactions has the greatest rate constant , k ? B Gibbs free energy (G) Reaction pathway A Reaction pathway C D F E Reaction pathway G H Reaction pathway A A B B C D C E F D G H E All of the rate constants are equal. 3
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8. Which of the following reactions has the greatest equilibrium constant , K , assuming the reactions are run at constant temperature and pressure? B Gibbs free energy (G) Reaction pathway A Reaction pathway C D F E Reaction pathway G H Reaction pathway A A B B C D C E F D G H E All of the equilibrium constants are equal. 9. The following reaction is important in producing “water gas” from coal.
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exam key - 1 CHEMISTRY 102 FINAL EXAM- KEY THURSDAY MAY 5,...

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