AHW1 - CHEMISTRY 4210, Spring 2010 HW-Chapter1 Name: _ 1....

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CHEMISTRY 4210, Spring 20 10 HW-Chapter1 Name: ______________________ SID:_________ 1. For the following reaction, (CH 3 ) 3 C–H + Cl–Cl → (CH 3 ) 3 C–Cl + H–Cl (DH°=400 kJ mol -1 ) (DH°=349 kJ mol -1 ) (DH°=243 kJ mol -1 ) (DH°=432 kJ mol -1 ) the overall H° is: A) +243 kJ mol -1 B) -138 kJ mol -1 C) +138 kJ mol -1 D) -781 kJ mol -1 E) +781 kJ mol -1 Ans: B 2. For the following reaction, CH 3 CH 2 CH 2 –H + Br–Br → CH 3 CH 2 CH 2 –Br + H–Br (DH°=423 kJ mol -1 ) (DH°=294 kJ mol -1 ) (DH°=193 kJ mol -1 ) (DH°=366 kJ mol -1 ) the overall H° is: A) +616 kJ mol -1 B) -101 kJ mol -1 C) -173 kJ mol -1 D) +57 kJ mol -1 E) -44 kJ mol -1 Ans: E
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3. For the following reaction, CH 3 CH 3 + Cl 2 → CH 3 CH 2 Cl + HCl (DH°) (421 kJ mol -1 ) (243 kJ mol -1 ) (353 kJ mol -1 ) (432 kJ mol -1 ) the overall H° is: A) -121 kJ mol -1 B) +121 kJ mol -1 C) +243 kJ mol -1 D) +664 kJ mol -1 E) -785 kJ mol -1 Ans: A 4. For the following reaction, (CH 3 ) 2 CH–H + F–F → (CH 3 ) 2 CH–F + H–F (DH°=413 kJ mol -1 ) (DH°=439 kJ mol -1 ) (DH°=159 kJ mol -1 ) (DH°=570 kJ mol -1 ) the overall H° is: A) +437 kJ mol -1 B) -437 kJ mol -1 C) -411 kJ mol -1 D) +26 kJ mol -1 E) -1581 kJ mol -1 Ans: B 5. Which of the reactions listed below would have a value of H° equal to zero? A) H–H → 2H· B) H· + CH 3 –H → CH 3 –H + C) CH 3 · + CH 3 · → CH 3 –CH 3 D) CH 3 · + CH 3 –H → CH 3 –H + CH 3 · E) Reactions (B) and (D) Ans: E
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6. Which of the reactions listed below would be exothermic? A) CH 3 –CH 3 → 2CH 3 · B) CH 3 · + CH 4 → CH 4 + CH 3 · C) 2(CH 3 ) 2 CH· → (CH 3 ) 2 CH–CH(CH 3 ) 2 D) H· + (CH 3 ) 3 CH → (CH 3 ) 3 CH + H· E) None of the above Ans: C 7. Which of the reactions listed below would be exothermic? A) H–H → 2H· B) H· + CH 3 –H → CH 3 –H + C) CH 3 · + CH 3 · → CH 3 –CH 3 D) CH 3 · + CH 3 –H → CH 3 –H + CH 3 · E) All of the above Ans: C 8. Which reaction would you expect to have the smallest energy of activation? H°(kJ mol -1 ) A) CH 3 · + CH 3 · → CH 3 CH 3 -378 B) CH 4 + → CH 3 · + HF -130 C) CH 4 + → CH 3 · + HI +142 D) CH 4 + Br· → CH 3 · + HBr +104 E) CH 4 + Cl· → CH 3 · + HCl +8 Ans: A 9. Which of the following reactions would have an activation energy equal to zero? A) CH 3 –CH 3 → 2CH 3 · B) H· + CH 3 CH 3 → CH 3 CH 3 + C) 2CH 3 CH 2 · → CH 3 CH 2 CH 2 CH 3 D) CH 3 · + CH 3 CH 3 → CH 3 CH 3 + CH 3 · E) None of the above Ans: C
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10. Which of the following reactions would have the smallest energy of activation? A) CH
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This note was uploaded on 11/05/2010 for the course CHEM 4000 taught by Professor Jursic during the Spring '10 term at UNO.

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AHW1 - CHEMISTRY 4210, Spring 2010 HW-Chapter1 Name: _ 1....

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