What factor increases the hardness of ionic substances?
A) the presence of more free electrons
B) an increased charge on the ions
C) a decreased charge on the ions
D) multiple bonds
Answer: B
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In the Bergeron process, water droplets move from
A) water droplets to ice crystals B) small water droplets to large water droplets C) large water droplets to small water droplets D) ice crystals to water droplets
Under wet and humid tropical conditions the least soluble material is the aluminum oxide called ________.
A. bauxite B. chert C. limonite D. peat E. humus
Which of the following is true of all lecithins?
A) Their fatty acids are all saturated. B) Their fatty acids are all unsaturated. C) There is always a phosphate group bound to carbon 1 of glycerol. D) There is always an unsaturated fatty acid bound to carbon 1 of glycerol.
A pool of warm, moist air remains aloft after a midlatitude cyclone has dissolved.
a. true b. false