1. Solids
Liquids
Gases 1

2. Solid- a substance that has a definite volume and shape
Liquid- definite volume but takes the shape of its container (flows).
Gas- a substance that has no definite volume or definite shape (flows) . 2

3. Soilds Particles are in motion and vibrate in place.
Expand only slightly when heated
Particles held closely together, usually in a regular arrangement or pattern.
A crystalline solid is a solid whose atoms, ions, or molecules are arranged in an orderly, geometric, three-dimensional structure.

4. Liquid Indefinite shape, flows, yet has a fixed volume.
Particles have enough energy to slide past one another.
LIQUID FLOW
Tend to expand when heated

5. Gases Expand to fill the container they are in.
Also take volume of container.
Are compressible.
Compressible due to all the space between the particles.

6. Change of State When you go from one state of matter to another.
Melting- the change in state from solid to liquid
Solid ice cube turning into water
Boiling (Evaporate)- the change in state from liquid to gas
Watching boiling water turn into steam and evaporate
Change of State

7. Freezing- the change in state from liquid to solid
Water freezing into ice
Condense- the change in state from a gas to a liquid
Water on the outside of your car window
Sublimation- Changing solid to gas
Change of State

8. Phase changes that REQUIRE energy
Melting- solid to liquid
Evaporation- Liquid to gas
Sublimation- Solid to gas

9. Phase changes that RELEASE energy
Condensation- gas to liquid
Freezing- liquid to solid
Deposition- gas to solid

10. PHASE CHANGE
Graph of temperature and pressure that shows in which phase a substance exists under certain conditions.
You can predict at what phase your substance will be

11. Phase Change for CO2
Phase diagrams are different for each substance because the boiling and freezing point is different.
Phase diagram for CO2 show why it sublimes at normal conditions.
Notice how it changes from a solid to a gas at 1atm.
We are going to increase the pressure and make CO2 go through the solid, liquid, and gas phase.

12. Heating/ Cooling Curve of a Water

13. Is it Endothermic or Exothermic?
Exothermic – gives off energy/heat
Gas to liquid to solid
Endothermic – absorbs energy/heat
solid to liquid to gas

14. 1. When ice melts a) a phase change occurs from a solid phase to liquid phase b) an endothermic process occurs which requires energy c) the water changes from a crystalline solid to a liquid d) all of the above

15. 2. When water freezes a) a phase change occurs from a liquid phase to a solid phase b) an exothermic process occurs where energy is lost from ice to the surroundings c) the liquid water changes from a random structure to a crystalline solid d) all of the above

16. 3. Which statement is not true
3. Which statement is not true. a) to change from a solid to a liquid requires energy b) depending upon the temperature, water can exist in solid, liquid or gas states c) solids and liquids have similar densities because particles of solids and liquids both touch d) in a solid the molecules have no motion, and no energy.

17. 4. Which of the following correctly describes what happens when an inflated balloon is compressed?
A. When the gas is compressed, the particles get smaller.
B. When the gas is compressed, the particles move closer together.
C. When the gas is compressed, the particles get larger.
D. When the gas is compressed, the particles move father apart.

18. 5. Which of the following correctly describe the particles in a solid compared to the particles in a liquid?
A. Particles in a solid are farther apart than particles in a liquid
B. Particles in a liquid are much farther apart, than particles in a solid.
C. Particles in a solid do not move at all, and particles in a liquid slide past one another.
D. Particles in a solid vibrate in place and particles in a liquid slide past one another.

19. Describe what is happening at each step?