In geologic time, Earth is currently in the:
a. Mesozoic Era.
b. Paleozoic Era.
c. Cenozoic Era.
d. Tertiary Period.
e. Jurassic Period.
C
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Which is an example of a nonmetallic mineral? Ca = calcium, Cu = copper, Al = aluminum
A. gypsum: CaSO4 B. azurite: Cu3(CO3)2(OH)2 C. gold: Au D. gibbsite: Al(OH)3
What coefficients balance the following equation? ________ P4 (s) + ________ H2 (g) ? ________ PH3 (g)
A. 2, 10, 8 B. 1, 4, 4 C. 4, 2, 3 D. 1, 6, 4
The primary destination of electronic waste exported from Europe and North America is
A) India and China. B) Europe and North America. C) Africa. D) South America.
Which of the following is expected to be true in the carbonate ion, CO32-?
A) The carbon atom does not have an octet. B) The carbon to oxygen bond lengths are the consistent with single bonds. C) The carbon to oxygen bond lengths are the consistent with double bonds. D) The carbon to oxygen bonds are shorter than single bonds but longer than double bonds.