1. Molecules in Motion

2. Objectives:  SWBAT define kinetic energy and describe how that relates to temperature.  SWBAT summarize the changing states of matter.  SWBAT describe examples of changing states of matter in nature. (ex. Fog, dew)  SWBAT draw and explain the changing phases (states) of matter diagram.

3. Vocabulary  Matter: Everything that has mass and takes up space.  Atom: the smallest particle of matter that retains the identity of its element. Bohr Model

4. New Vocabulary  Kinetic Energy: the energy of motion.

5. Kinetic Energy

6. New Vocabulary  Temperature: a measure of the average kinetic energy of the atoms or molecules of a substance.

7. New Vocabulary  Heat: the energy that is transferred from a substance at a higher temperature to a substance at a lower temperature.

8. States (Phases) of Matter  States of Matter: Solid, liquid, & gas

9. Changing States (Phases) of Matter  Melting: a solid changes to a liquid. As temperature increases, the kinetic energy of the individual atoms increases. Atomic motion increases Space between atoms increases

10. Melting: A range of temperatures

11. Changing States (Phases) of Matter  Evaporation: a liquid changes to a gas. Motion of atoms increases Space between atoms increases

12. Changing States (Phases) of Matter  Sublimation: a substance changes directly from a solid to a gas, skipping the liquid phase.

13. Changing States (Phases) of Matter  Condensation: a gas changes to a liquid. As temperature decreases, the kinetic energy of the atoms decreases. Atomic motion decreases Space between atoms decreases

14. Changing States (Phases) of Matter  Freezing: a liquid changes to a solid. Kinetic energy decreases. Atoms become locked in fixed positions and only vibrate.

15. Freezing of Water  Water molecules move further apart as the freeze unlike most molecules that move closer together when changing from a liquid to a solid.

16. Changing States (Phases) of Matter  Deposition: a gas changes directly to a solid. This is how frost forms.

17. The Water Cycle & Phases of Matter

19. Changing States (Phases) of Matter  Clouds: form when liquid water evaporates to become water vapor. As water vapor rises, it cools and condenses forming tiny droplets of water that are suspended in the air as clouds.

20. Changing States (Phases) of Matter  Rain: condensing water vapor in the clouds coalesces (joins together) to become bigger drops. The drops become heavy enough to fall as rain.

21. Changing States (Phases) of Matter  Dew: formed when moist air close to the ground cools enough to condense and form liquid water.

22. Physical Vs. Chemical Changes  https://www.youtube.com/watch?v=X328AWaJXvI https://www.youtube.com/watch?v=X328AWaJXvI  Changing states of matter is a physical change; they can be undone.  Physical Change: the substances are not altered chemically. No new products are formed. Reversible.

23. Physical Vs. Chemical Changes  Chemical Change: substances are altered chemically and new products are formed. The change can not be undone. Examples: burning fuel, rusting metal

24. Physical Vs. Chemical Changes  Chemical Not easily reversed New products formed Reactants used up Often heat/light/sound occurs Electricity may be produced A precipitate may form Ex. Wood burning, metal rusting  Physical Easily reversible NO new products Often a substance just changes phases (from a solid to a liquid, etc)