Exam-1_Answer_key_and_grading_criteria

Exam-1_Answer_key_and_grading_criteria - roughly balanced....

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CHEM/ENVS 380 S10 Exam-1 CHEM/ENVS 380 S10 Exam-1 Answer Key I. Grading Criteria Multiple choice questions with 2 correct answers # correct selections # incorrect selections score 0 n/a 0 1 does not count 2.5 2 0 5 2 1 4 2 2 2.5 Multiple choice questions with 3 correct answers # correct selections # incorrect selections score 0 n/a 0 1 does not count 2 2 0 4 2 1 4 2 2 3 3 0 5 3 1 4 II. Multiple Choice Q Answers Look at the bottom right corner of your exam to find out which version you have: blank Answer Key a Answer Key-a b Answer Key-b Answer Key 1 2 3 4 5 6 7 8 9 10 11 12 13 e a,b d,e b,d a,d e b,c b,c a,d b b d a,d,e Answer Key-a 1 2 3 4 5 6 7 8 9 10 11 12 13 b,c e b b a,b b,d d,e a,d b,c a,d,e a,d e d Answer Key-b 1 2 3 4 5 6 7 8 9 10 11 12 13 d a,b d,e b,d a,d a,d,e b,c e a,d e b,c b b
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CHEM/ENVS 380 S10 Exam-1 III. Short Answer Qs 14. CBrClF 2 , CFC-11, CH 3 Cl, HFC-134a 15. When a system is near steady state with respect to a substance (or some intensive property), then the rate at which that substance is supplied to the system, and removed from the system, are
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Unformatted text preview: roughly balanced. This results in a situation where the amount of the substance in question remains constant with time. Any real-life example that mimics this was given full credit. 16. (1) Volcanic activity can temporarily lower ozone levels (via emission of SO 2 which generates sulfate aerosols which act like PSCs); (2) decreased solar output may reduce ozone production; (3) unusually cold polar winters can strengthen the polar vortex, thereby enhancing ozone loss. Brief mention of any of the above three is worth 5 points each. CFCs having long lifetimes in the atmosphere is not a valid reason, because it is not specific to any particular year. 17. (a) 0.059 ppm; (b) 59 g of P; (c) 0.20 kg of F...
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This note was uploaded on 09/23/2011 for the course CHEM 380 taught by Professor Staff during the Spring '11 term at S.F. State.

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Exam-1_Answer_key_and_grading_criteria - roughly balanced....

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