Which of the following statements best describes a relatively polar bond?
A. two very electronegative atoms undergo ionic bonding
B. two weakly electronegative atoms undergo ionic bonding
C. two very electronegative atoms are covalently bound
D. a very electronegative atom and a weakly electronegative atom are covalently bound
E. none of the above
Answer: D
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NASA scientist Jim Hansen has recommended that we bring our atmospheric carbon dioxide levels down to _____ from the current level of _____ in order to maintain a planet with fairly constant atmospheric temperatures
a. 450 ppm, 500 ppm b. 350 ppm, 390 ppm c. 388 ppm, 450 ppm d. 488 ppm, 550 ppm e. 560 ppm, 660 ppm
Consider an airplane flying from standard temperature air into warmer than standard temperature air. Without making any correction, the altimeter in the warmer air would indicate which of the following conditions?
A. an altitude exactly the same as the airplane's altitude B. an altitude correction factor to be used by the pilot C. an altitude higher than the airplane's actual altitude D. an altitude lower than the airplane's actual altitude
What are the two sources of energy that drives the earth's processes?
What will be an ideal response?
In general, the release of toxic chemicals into the environment over the past 30 years has
A) increased dramatically in the United States, doubling about every 10 years as the U.S. population has increased. B) increased slightly in the United States, about 10% per decade, as the U.S. population has increased. C) remained steady in the world, despite increases in the world's population. D) greatly declined, by more than 60%, despite increases in the world's population.