Chemistry is the science of the composition, behavior, structure, and properties of matter, as well as the changes it undergoes during chemical reactions. It is a physical science that studies various molecules, atoms, crystals and other aggregates of matter whether in combination or isolation, which incorporates the concepts of entropy and energy in relation to the spontaneity of chemical processes.

Modern chemistry evolved out of alchemy following the chemical revolution in 1773.

Chemistry studies the interactions of chemical substances that are constituted of atoms, or the subatomic particles: protons, neutrons and electrons.

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