Which of the following is a synthetic greenhouse gas?
A) chlorofluorocarbons
B) nitrogen
C) water vapor
D) oxygen
E) methane
A
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A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is
A) zero. B) doubled. C) quadrupled. D) unchanged.
How do we know why some rocks break and others flow?
What will be an ideal response?
Which of the following is true of glucose, C6H12O6, when it dissolves in water?
A) It dissociates into ions. B) It forms covalent bonds with water. C) It forms hydrogen bonds with water. D) None of the above, glucose does not dissolve in water.
Cogeneration refers to
A. production of both electricity and usable steam or hot water by the same facility. B. sale of electrical power by consumers back to the electrical grid. C. cooperative efforts between power producers and consumers aimed at sharing profits from energy sales. D. the production of electricity using several different fuel sources at a single facility.