State Changes AKA= Phase Changes. Review: 3 States of Matter Solid Liquid Gas.
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Transcript of State Changes AKA= Phase Changes. Review: 3 States of Matter Solid Liquid Gas.
What is a State Change?• It is a change from one state of matter
(solid, liquid, gas) to another.• Phase changes are physical changes
because:- It only affects physical appearance,
not chemical make-up.
- Reversible
What happens during a state change?
• During a state change, thermal (heat) energy is either absorbed or released.
• Heat energy is released as molecules slow down and move closer together.
• Heat energy is absorbed as molecules speed up and expand.
Melting• Phase change from a
solid to a liquid
• Molecules speed up, move farther apart, and absorb heat energy
Freezing• Phase change from a
liquid to a solid
• Molecule slow down, move closer together and release heat energy.
Vaporization (Boiling)• Phase change from a
liquid to gas. It occurs at the boiling point of matter.
• Molecules speed up, move farther apart, and absorb heat energy.
Evaporation• Phase change from a
liquid to a gas on the surface of a liquid (occurs at all temperatures).
• Molecules speed up, move farther apart, and absorb heat energy, enough to escape liquid.
Condensation• Phase change from a
gas to a liquid.
• Molecule slow down, move closer together and release heat energy.
Sublimation• Phase change from a
solid to a gas.
• Molecules speed up, move farther apart, and absorb heat energy.
Deposition• Phase change from a
gas to a solid.
• Molecules slow down, move closer together and release heat energy.