What are unit conversions used for? A. Unit conversions are used to write very large numbers.
B. Unit conversions express an amount in a different unit.
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C. Unit conversions express the fractional size of something.
D. Unit conversions associate a number with its units.

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.