States of Matter

Physical and Chemical Changes

Classifying Matter

Chemistry is the study of matter.

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Matter is anything that has mass and volume.

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•Solids•Liquids•Gases

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•Have a definite shape•Have a definite volume•Atoms close together and moving very slowly

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• Have an indefinite shape

• Have a definite volume

• Atoms not as close and moving quicker

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• Have an indefinite shape

• Have an indefinite volume

• Atoms spread apart and moving quickly

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At 100°C, water becomes water vapor, a gas. Molecules can move randomly over large distances.

Below 0°C, water solidifies to become ice. In the solid state, water molecules are held together in a rigid structure.

Between 0°C and 100 °C, water is a liquid. In the liquid state, water molecules are close together, but can move about freely.

•All matter can exist in all three phases depending on the TEMPERATURE.

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•To absorb heat means to add heat!

•To absorb heat means to add heat!

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To release heat means to cool or lose heat.

To release heat means to cool or lose heat.

The change of a solid to liquid is called…

MELTING

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The change of a liquid to a gas is called…

BOILING OR VAPORIZATION

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The change of a solid to a gas is called…

SUBLIMATION

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The change of a gas to a liquid is called…

CONDENSATION

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The change of a liquid to a solid is called…

FREEZING