The difference between industrial and photochemical smog is that photochemical smog ____.
A. is produced by stationary sources rather than mobile ones
B. contains secondary pollutants formed under the influence of UV radiation from the sun
C. contains carbon dioxide
D. is not related to coal burning
E. involves reactions with oxygen
Answer: B
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All of the following statements about coral reefs are true, except
A) they grow to just below the ocean surface. B) they require warm water. C) their composition is independent of water temperature. D) their shells are composed primarily of calcium.
Formaldehyde has the chemical formula CH2O. How many nonbonding electrons must be shown in the Lewis structure of formaldehyde?
A) 0 B) 4 C) 8 D) 12
Which of the following reagents is capable of hydrolyzing glycosides?
A) acids B) bases C) water D) all of these
The heat energy in a pound of body fat is 3500 Calories. If a woman's diet has an average caloric intake of 2500 Cal/day, by what percentage must this be reduced if she wishes to lose 10 pounds in 30 days? [Assume that her level of physical activity remains the same during the 30 days as it was before dieting began.]
A) 7.1% B) 14.2% C) 46.7% D) 53.3%