0711ch_p - Chemistry 12 Examination Booklet 2007/08...

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Contents: 19 pages Examination: 2 hours 50 multiple-choice questions Additional Time Permitted: 60 minutes © Province of British Columbia Chemistry 12 Examination Booklet 2007/08 Released Exam August 2008 Form A DO NOT OPEN ANY EXAMINATION MATERIALS UNTIL INSTRUCTED TO DO SO. FOR FURTHER INSTRUCTIONS REFER TO THE RESPONSE BOOKLET.
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Chemistry 12 – 0808 Form A Page 1 PART A: MULTIPLE CHOICE Value: 62.5% of the examination Suggested Time: 80 minutes INSTRUCTIONS: For each question, select the best answer and record your choice on the Answer Sheet provided. Using an HB pencil, completely fill in the bubble that has the letter corresponding to your answer. You have Examination Booklet Form A . In the box above #1 on your Answer Sheet , fill in the bubble as follows. F ABCDE H G Exam Booklet Form/ Cahier d’examen 1. Consider the reaction: H 2 g () + I 2 g ± 2HI g Which of the following would decrease the rate of reaction? A. an increase in I 2 [] B. a decrease in HI C. a decrease in H 2 D. an increase in temperature 2. Consider the reaction: ZnS s () + H 2 SO 4 aq + 1 2 O 2 g ± ZnSO 4 aq + Ss H 2 O ± What would increase the fraction of successful collisions? I increasing temperature II increasing surface area of ZnS III increasing H 2 SO 4 IV adding a suitable catalyst A. I and II only B. I and IV only C. II and III only D. I, II, III and IV
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Page 2 Chemistry 12 – 0808 Form A 3. Consider the following two reactions occurring under the same conditions: I C 2 H 5 Cl ± () ± C 2 H 4 g () + HCl g E a = 254 kJ II C 2 H 5 Br ± ± C 2 H 4 g HBr g E a = 219kJ Which of the following is correct? A. Reaction I is faster because it has a higher E a . B. Reaction II is faster because it has a lower E a . C. Reaction I is slower because it is exothermic. D. Reaction II is slower because it is endothermic. 4. An uncatalyzed reaction has the following values for E a : E a forward = 250 kJ E a reverse = 100 kJ If a catalyst is added to the reaction, which of the following values could be correct? E a forward kJ E a reverse kJ ± H forward kJ A. 50 200 ± 150 B. 50 200 + C. 200 50 ± D. 200 50 +
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Chemistry 12 – 0808 Form A Page 3 5. Consider the following reaction mechanism: Step 1: C 2 H 5 HgI ± C 2 H 5 Hg + + I ² Step 2: C 2 H 5 Hg + + Cl ± ² Particle 1 Overall C 2 H 5 HgI + Cl ± ² C 2 H 5 HgCl + I ± Identify Particle 1 and a reaction intermediate from the above mechanism. Particle 1 Reaction Intermediate A. C 2 H 5 Hg + C 2 H 5 HgI B. C 2 H 5 C 2 H 5 Hg + C. C 2 H 5 HgCl I ± D. C 2 H 5 C 2 H 5 Hg + 6. Consider the following PE diagram for a reversible reaction: 400 300 200 Progress of the reaction PE (kJ) 500 Which of the following correctly corresponds to the diagram above? PE of activated complex (kJ) E a reverse () (kJ) ± H forward kJ A. 150 200 + 50 B. 200 150 ± 50 C. 450 150 + 50 D. 450 300 + 50
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Page 4 Chemistry 12 – 0808 Form A 7. Reacting systems naturally tend toward what changes in enthalpy and entropy?
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This note was uploaded on 04/08/2012 for the course ECON 101 taught by Professor Dr.roger during the Spring '10 term at Alvernia University.

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0711ch_p - Chemistry 12 Examination Booklet 2007/08...

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