The design of automobiles with fuel cells can be more flexible because they
A) do not have wheels.
B) have to be so large that there is extra room for passengers and accessories.
C) do not have an engine fuel combustion compartment.
D) do not have to be aerodynamically constructed to have better fuel mileage.
C
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The warm zone near the top of the stratosphere is the result of heating from ________
A) atmospheric pollution B) the rise of air C) the output of volcanoes D) thermal infrared emissions from clouds E) the natural breakdown of ozone
How much energy, in kilojoules, is released or absorbed from the reaction of one mole of nitrogen, N2, with three moles of molecular hydrogen, H2, to form two moles of ammonia, NH3? H-N (bond energy: 389 kJ/mol)H-H (bond energy: 436 kJ/mol)N 
N (bond energy: 946 kJ/mol) N N + H-H + H-H ? NH3 + NH3
A. ?80 kJ/mol released B. +80 kJ/mol absorbed C. +899 kJ/mol absorbed D. ?993 kJ/mol released
The point on Earth's orbit around the sun when the two bodies are farthest apart is called:
a. perihelion. b. aphelion. c. ecliptic. d. equinox.
The term country is a synonym for state
Indicate whether the statement is true or false.