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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 A B C D E 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 ( ) + S s ( ) + 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
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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 = 219 kJ Which of the following is correct? 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 ( )
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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 HgI C 2 H 5 Hg + C. C 2 H 5 HgCl I ± D. C 2 H 5 HgCl C 2 H 5 Hg +
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