Chapter 7.2 State of Matter

Chapter 7 Section 2 States of Matter

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.

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.

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

Chapter 7.3 Changes in State of Matter

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