Most of chemistry is based upon the use of models (and I do not mean the little balls and sticks that are sometimes used to help learn chemical structures).
Chemistry is involved with the interactions of atoms to form molecules. Individual atoms and molecules are too small to see even with instrumentation. In addition, they are usually involved in numbers so great that the human mind has no real conception of the vastness of the quantities.
Modeling enables chemists to at least pretend that they know what is going on during a reaction. Chemical kinetics is one area of study that would be impossible without models. Organic and Inorganic mechanisms is another.
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