Phases of matter
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Phases of Matter. 4 of them…What are they. Solids- Have a definite shape and definite volume. Atoms are very tightly packed together Liquid- Atoms are not packed as tightly. Free to move. They take the shape of its container. Have a definite volume but no definite shape Gas-

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Phases of Matter

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Phases of matter

Phases of Matter


4 of them what are they

4 of them…What are they

  • Solids-

    • Have a definite shape and definite volume. Atoms are very tightly packed together

  • Liquid-

    • Atoms are not packed as tightly. Free to move. They take the shape of its container.

    • Have a definite volume but no definite shape

  • Gas-

    • Does not have a definite shape or volume. Tend to spread far away from another, but can also be packed very tightly together.

  • Plasma

    • Very rare on earth. Has extremely high energy and dangerous to living things. Examples are the suns and stars.


Phase changes

Phase Changes

  • Solids have less energy than liquids.

  • Liquids have less energy than gas

  • In order to change phases, energy either has to be added or removed.


There are 5 phase changes

There are 5 phase changes

  • Melting

  • Freezing

  • Vaporization

  • Condensation

  • sublimation


Phases of matter

Melting

  • The change of a solid to a liquid.

    • Occurs when a substance absorbs energy.

    • Point at which solid changes to a liquid is called it’s “melting point”

    • Why do we pour salt on icy side walks?

      • Lowers the freezing point. The water won’t freeze

        Until the temp reaches -20 degrees.

  • The opposite occurs when liquid changes to a solid.

    • Freezing. Substance loses energy.

    • Why do we use anti-freeze in cars?

      • Again, it lowers the freezing point so that the car’s engine doesn’t freeze up.

Ice vs salt


Vaporization

Vaporization

  • The change of a substance from a liquid to a gas.

    • Liquid needs to absorb energy in order to change into gas.

    • Boiling water. What happens if you boil a pot of water overnight?

      • All the liquid water changes to gas


Condensation

Condensation

  • If a substance in the gas phase loses energy, it changes into a liquid.

  • Some examples:

    • Ice cold drinks

    • Bus windows

    • Walls of a tent at night

    • Dehumidifier


Sublimation

Sublimation

  • When an object goes from a solid to a gas.

    • It skips the liquid phase.

  • Dry Ice-what is it?

    • Solid carbon dioxide (CO2)

    • We normally only see carbon dioxide as an invisible gas. But if cold enough we can freeze it.

Dry ice


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