For which class of compounds does the lack of free rotation around carbon-carbon bonds result in the existence of cis-trans isomerism?
A) alkanes
B) alkenes
C) alkynes
D) arenes
B
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What does the shape of these crystals indicate about the environment in which they formed? 
A. They grew during an explosive volcanic eruption. B. They formed from cold water that was moving rapidly through the rocks. C. They formed at great depth and under very high pressures. D. They formed into a space filled with water rather than solid rock.
Acceleration is a measure of
A. a change in velocity. B. how fast how-fast changes. C. both of these D. none of the above
Which of the following produces the largest amount of hazardous waste?
A) utilities B) households C) industry D) military E) agriculture
An energy surplus in the atmosphere from solar radiation occurs:
A) between midnight and dawn. B) between sunset and midnight. C) in the morning. D) exactly at midnight. E) in the early afternoon.