States of Matter & Phase ChangeATI TEAS 7 cheat sheet

Solid, liquid, gas

9 key facts 5 practice questions Reviewed Oct 2026

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The States

Solid — fixed shape and volume, particles vibrate in place
Liquid — fixed volume, takes the container's shape
Gas — fills the container, particles far apart

Phase Changes

Melting, freezing, vaporization, condensation
Sublimation — solid straight to gas (dry ice)
Deposition — gas straight to solid

Energy

Adding heat increases particle motion
Temperature stays constant during a phase change — the energy breaks bonds

Gas Laws

Pressure and volume are inverse; volume and temperature are direct

Key takeaway

Solid, liquid, gas

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The amount of matter in an object is its:

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