1. UNIT 2
Changes in
State

2. 1.) Particle Arrangement
The state (phase) of matter that we recognize is determined by 2 things.
1.) Particle Arrangement
2.) Temperature

3. By changing the temperature (energy) acting on a substance you can change the state (phase) of matter it is in.

4. State (Phase) Changes
Melting
Freezing
Evaporation
Condensation
Sublimation

5. ( candy bar in your pocket )
Melting
When a solid changes into a liquid.
* must increase the energy acting upon it
( candy bar in your pocket )

7. Freezing When a liquid changes into a solid.
* must decrease the energy acting upon it
( water turning to ice )

9. Evaporation When a liquid changes to a gas.
* must increase the energy acting upon it
( hand sanitizer )

11. ( sweat on a drinking glass )
Condensation
When a gas changes to a liquid.
* must decrease the energy acting upon it
( sweat on a drinking glass )

13. ( dry ice, or ice in a freezer)
Sublimation
When a solid changes into a gas without a liquid state.
*can occur by increasing or decreasing the energy
( dry ice, or ice in a freezer)

15. Copy the
Chart into
your Notes.

16. L 1 5 4 2 S G 3

17. Heat of Fusion
The amount of energy needed to turn a solid into a liquid.
* changes with the material in the solid
* how they extract metals out of rock

18. Heat of Vaporization
The amount of energy needed to change a liquid into a gas.
* changes with the material in the liquid
* how they increase the concentration of a liquid in cooking

20. As faster moving particle escape, the energy of the remaining particles become less.
* the temperature drops
* cooling effect as water evaporates off your skin

21. Boiling When evaporation occurs throughout a liquid.
* evaporation starts next to the heat source

22. The End