Which statements below are true? Check all that apply.
O A. Distance measurements must include magnitude, unit, and
direction.
B. Displacement can be fully described with a magnitude and a unit.
I c. If motion starts and stops at the same location, then the
displacement is zero.
D. Distance is always greater than or equal to the magnitude of the
displacement.
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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.