The chlorinated fluorocarbons molecules are acting as a(n) ________ by converting hundreds of thousands of molecules before they are inactivated.
A. catalyst
B. acid
C. active site
D. aerosol
E. base
Answer: A
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Due to the advent of humans orbiting in space, the usual definition of weight is extended beyond gravitation due to the
A. absence of gravity in free space. B. support force provided in rotating habitats. C. both of these D. none of the above
Taiga and tundra both ________
A) have many burrowing rodents B) are found in the southeastern United States C) have comparatively low temperatures throughout the year D) lack trees E) lack many birds
An unknown mineral sample scratches fluorite but cannot scratch apatite. What is the approximate hardness of this mineral?
A. 4 B. 3.5 C. 5 D. 4.5
Compared to men, women in Europe generally earn:
A) the same B) 16% more per hour C) 16% less per hour D) 50% less per hour E) 50% more per hour