Carry out the following calculation, paying special attention to significant figures, rounding, and units: (1.01 × 102 g)(44.7 m/s)2 2 = × 10 g·m2/s2

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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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.