Chemistry is best defined as "the study of matter and how matter changes." It involves examining the composition, structure, properties, and changes of substances, as well as the energy changes that accompany those transformations. The other options you provided touch on aspects related to chemistry but do not fully encapsulate its broad scope.
What is chemistry?
The study of energy and power.
Anything that has mass and takes up space.
A characteristic of a substance that describes its ability to change.
The study of matter and how matter changes.
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