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.

B: Unit conversions express an amount in a different unit.

Explanation:

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.