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Atoms

Back

The basic unit of a chemical element.

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Molecules

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Two or more atoms bonded together.

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Protons

Back

Positively charged subatomic particles found in the nucleus of an atom.

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Neutrons

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Subatomic particles with no charge, found in the nucleus of an atom.

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Electrons

Back

Negatively charged subatomic particles orbiting the nucleus of an atom.

Front

Atomic Mass Unit

Back

A unit of mass used to express atomic and molecular weights.

Front

Endothermic

Back

A process or reaction that absorbs energy in the form of heat.

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Exothermic

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A process or reaction that releases energy in the form of heat.

Front

Heating Curve

Back

A graph that shows the change in temperature of a substance as heat is added.

Front

Cooling Curve

Back

A graph that shows the change in temperature of a substance as it loses heat.