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MEC280 - Test-2 Study Questions

MEC280 - Test-2 Study Questions - MEC-280 Midterm 2 1 How...

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MEC-280 Midterm 2 1. How many miles above the earth’s surface is the ozone layer? a. 12 to 25 miles b. 18 to 30 miles c. 25 to 40 miles d. 30 to 50 miles 2. Which atom destroys the ozone the most? 3. Which atom destroys the least ozone? 4. The ozone layer was formed about 5. CFCs were developed in the early_____ a. 1920s b. 1930s
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c. 1940s d. 2000s 6. What does Y represent in the chemical reaction below? + + O3 Y O2 O 7. Which of the following atoms is not a halogen? 8. CFCs (chloro-fluro-carbons) were used in 9. Which of the following is not a greenhouse gas? a. Carbon dioxide b. Methane c. Ozone d. Oxygen 10. A hole (50% reduction) in the Antarctic ozone layer was first observed in the
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11. CFCs (chloro-fluro-carbons) were used in 12. Which of these greenhouse gases has the highest percentage composition in the atmosphere? 13. 60% of the CFC-12 will disappear from the atmosphere in about a. 55 years b. 116 years c. 173 years d. 210 years
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