Water, H2O, and methane, CH4 have about the same mass and differ by only one type of atom. Why is the boiling point of water so much higher than that of methane?
A) The water molecule is less symmetrical than is the methane molecule.
B) The oxygen of a water molecule has two lone pairs of electrons.
C) The electronegativity difference between oxygen and hydrogen is greater than the electronegativity difference between carbon and hydrogen.
D) all of the above
D
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Why can seawater hold many times more carbon dioxide than either nitrogen or oxygen at saturation?
a. Carbon dioxide is not used in photosynthesis. b. Carbon dioxide is used in mineral formation. c. Carbon dioxide combines chemically with water to form carbonic acid. d. Carbon dioxide is more reactive. e. Carbon dioxide is used by plankton for energy
Hurricane Katrina lost most of its power when
A) sea surface temperatures underneath it increased. B) it was still a tropical depression. C) it made landfall in the United States. D) its eye was most fully developed. E) its spiral rainbands were most prominent.
During orientation you learn that all classrooms on campus are air conditioned. You decide to bring a sweatshirt to class even on the hottest days. What type of reasoning did you use?
A. inductive B. deductive C. neither inductive nor deductive - the decision did not involve science
A depositional feature formed when a fast-flowing stream joins a slower one or a mountain stream flows out into a plain is
A. an oxbow. B. a meander. C. an alluvial fan. D. a floodplain.