Most of the key energy-generating chemical reactions used by life on Earth are
A) rearrangement reactions
B) redox reactions
C) decomposition reactions
D) combination reactions
B
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Which of the following types of Universe has no center and no edge?
a. closed b. flat c. open d. All of the other choices are correct.
The observational evidence in favor of the existence of dark energy involves using ________ to calculate ________.
A. the method of standard candles; the distance to distant galaxies B. the method of inflation; the distance to distant galaxies C. Hubble's law; the distance to distant galaxies D. Hubble's law; the age of the Universe
A watt is equal to
a. 746 horsepower b. one calorie c. one joule d. 1 J/s e. a unit of energy
A series of ocean waves, each 24.0 m from crest to crest and moving past an observer at a rate of 6.0 waves per second, has what speed?
a. 144 m/s b. 4 m/s c. 6 m/s d. 0.25 m/s