1. Chapter 7.2 State of Matter

2. Chapter 7
Section 2 States of Matter

3. Pressure
measures the amount of force exerted per unit area of a surface. P = Force/ area
When air particles collide within a container, they exert more pressure.
In the next slide, the beach ball has less pressure because it has fewer gas particles.

5. Plasma: A Fourth State of Matter
Plasma is a state of matter that starts as a gas and then becomes ionized (loses electrons). Its properties differ from those of a solid, liquid, or gas.
Plasma is created when energy is added to a gas.
Most common state of matter in the universe.
Ex. The Sun.
The sun's enormous heat rips electrons off the hydrogen and helium molecules that make up the sun. Essentially, the sun, like most stars, is a great big ball of plasma.

6. solid liquid gas plasma
Definite Shape
No Definite Shape
Definite Volume
No Definite Volume
Particles tightly compact
Particles slightly separated
Particles very spread out.
Particles ionized

7. Chapter 7.3 Changes in State of Matter

9. Frost on car windshield
Change
From To
Thermal energy
Example
Sublimation
solid
gas
Added
endothermic
Dry ice
Removed exothermic
Frost on car windshield
Evaporation
liquid
Added endothermic
Rain dries up
Melting
Ice turns to water
Freezing
Water turns to ice
Condensation
Drops of water form on mirror while showering