When an ion gains electrons, this is called a(n) _________reaction.
Fill in the blank(s) with the appropriate word(s).
reduction
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Energy Levels: What is the energy of the photon emitted when an electron drops from the n = 20 state to the n = 7 state in a hydrogen atom?
A. 0.244 eV B. 0.263 eV C. 0.283 eV D. 0.302 eV
A homeowner has a new oil furnace which has an efficiency of 60%. For every 100 barrels of oil needed to heat his house, how much (in barrels of oil) goes up the chimney as waste heat?
A. 20 B. 60 C. 40 D. 80 E. 10
The lesser amount of a substance in a solution is generally called the
a. solute. b. salt. c. solvent. d. alloy.
What surprising discovery did the New Horizons spacecraft make during its 2015 flyby of Pluto?
A) Pluto has the largest known volcano in the solar system. B) Pluto's surface consists mostly of rocky material. C) Pluto's surface shows signs of very recent geological activity. D) Pluto is an escaped moon of Neptune. E) all of the above