What role does entropy play in chemical reactions?
A) The entropy determines how much product will actually be produced.
B) The entropy change determines whether the reaction will be exothermic or endothermic.
C) The entropy change determines whether the reaction will occur spontaneously or not.
D) The entropy change determines whether or not the chemical reaction is favorable.
Answer: D
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The choices below describe four hypothetical planets. Which one would you expect to have the most features of erosion? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: same as Venus. Distance from Sun: same as Mars. Rotation rate: once every 25 hours. B) Size: same as the Moon. Distance from Sun: same as Mars. Rotation rate: once every 10 days. C) Size: twice as big as Earth. Distance from Sun: same as Mercury. Rotation rate: once every 6 months. D) Size: same as Mars. Distance from Sun: same as Earth. Rotation rate: once every 18 hours.
Which of the following is not a unit of power?
a. ft • lb/s b. kW • h c. J/s d. watt
Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body is now 1/2 of the original force
Indicate whether the statement is true or false
When projected through a single lens, the image of a movie on a screen is
A. real and inverted. B. virtual and inverted. C. real and upright. D. virtual and upright. E. virtual and enlarged.