1. Physical Changes
Changes of State

2. Changes from one state to another (ie
Changes from one state to another (ie. Solid to liquid, liquid to gas, etc…)
Molecules themselves do NOT change
What does change is the arrangement of molecules and space between them
Basic substance remains the same

3. to
Gas
Liquid

4. Melting

6. Iron melts. It was solid, now it is liquid.

7. Freezing

10. Water freezes. It was liquid, now it is solid.

11. Evaporation
Includes boiling

14. The water also changed from liquid to gas when it boiled.
Water evaporates from the car. It was water, now it is vapor (a gas) in the air.
The water also changed from liquid to gas when it boiled.

15. Sublimation

17. The dry ice (frozen carbon dioxide) immediately converts from solid to gas. You can see vapors coming out of the pan.

18. Condensation

20. Warmer air condenses on the cooler bottle of liquid
Warmer air condenses on the cooler bottle of liquid. Air changed directly from gas to liquid.
Where did the water droplets come from in this picture? Inside or outside the bottle?

21. Deposition

23. Frost occurs when air changes directly to a solid
Frost occurs when air changes directly to a solid. Frost is like ice on the windshield that was once a gas.