Websters Dictionary defines chemistry as:
the science that treats of the composition of substances, and of the transformations which they undergo.

The following are a few key deffinitions that will be useful to know when studing chemistry:

Variables: Various factors that must be controlled in an experiment to allow researchers to come to valid conclusions.

Theory: An explanation of an observation that is based on experimentation and reasoning.

Hypothesis: A proposition based on certain assumptions that can be evaluated scientifically.

Scientific Law: A Statement or mathematical expression of some consistency about the behavior of the natural world.

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