Why does the melting point of hydrocarbons increase as the number of carbon atoms per molecule increases?
A. because of greater induced dipole-induced dipole molecular attractions
B. Larger hydrocarbon chains tend to be branched.
C. The molecular mass also increases.
D. An increase in the number of carbon atoms per molecules also means an increase in the density of the hydrocarbon.
Answer: A
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Placing geologic events in a chronological order from their position in the rock record is
a. neptunism. d. absolute dating. b. uniformitarianism. e. none of the above. c. relative dating
The best description of anthropogenic activities is ________
A) human activities that reduce carbon emissions through taxing fuel used for automobiles B) human activities that increase greenhouse gases in the atmosphere C) all activities by humans affecting the Earth and its biosphere D) human activities that reduce carbon emissions through tax credits for reducing automobile emissions E) human activities that decrease greenhouse gases in the atmosphere
Epiphytic plants, such as various species of orchids (Orchidaceae), grow upon another plant, using the plants for physical support, but bringing no harm to the host plant. This is an example of which symbiotic relationship?
A) parasitism B) mutualism C) commensalism D) amensalism E) synnecrosis
How much precipitation do deserts receive?
A) Less than 250mm B) 450-550mm C) 250-350mm D) 350-450mm E) 550-650mm