1. Bellwork – 01/22/14
1] Evaporation of rubbing alcohol – physical or chemical change?
2] Would you add or remove energy ( to/from the water ) to do this?
** What is the source of the energy?

2. Bellwork – 01/22/14
1] Evaporation of water – physical or chemical change?
Physical
2] Would you add or remove energy ( to/from the water ) to do this?
Add

3. Grab notebooks/study guides at front of room Bellwork:
What are the four states of matter?

4. What are the four states of matter? Solid, Liquid, Gas, Plasma
Bellwork:
What are the four states of matter?
Solid, Liquid, Gas, Plasma

5. TN Standards
CLE.3202.Inq.2 – Recognize that science is a progressive endeavor that reevaluates and extends what is already accepted
CLE.3202.Inq.3 – Use appropriate tools and technology to collect precise and accurate data
CLE.3202.Inq.6 – Communicate and defend scientific findings
CLE – Investigate chemical and physical changes

6. How Does Matter Change States? Essential Questions:
1] What makes up matter?
2] What kind of energy do all particles of matter have?
3] What happens when a substance changes from one state of matter to another?
4] What happens to mass and energy during physical and chemical changes?

7. Demonstration 1 Have cotton balls with rubbing alcohol added
Student in the front of each row come to the front and grab enough cotton balls for row
Each student rub the alcohol on their arm ( skin )
What happens? What kind of sensations do you feel?
Why is this happening?

8. What is Happening? Evaporation
Your body heat gets transferred to the rubbing alcohol and it evaporates
This gives that part of your skin a “cooling” sensation

9. Some Changes Absorb Energy
Energy is added when water ( or any substance ):
Evaporates
Melts
Sublimates ( dry ice )

10. Some Changes Release Energy
Energy is removed when water ( or any substance ):
Condensation
Freezing

11. Sweating – Cools Your Body
So which of the five state changes does sweating represent?
Is energy released or absorbed when the sweating process occurs?
How does a dog sweat?

12. Demonstration 2 ( ongoing )
Will start boiling water in the back of room
Will take a few notes while water boils
Once water boils, will add ~butter to it

13. Changes of State
The identity of a substance does not change when the state changes but the energy changes

14. Active Demonstration I will guide you through this
We will have three groups
Each group will act like either particles in a gas, liquid, or solid ( one at a time )
Each group will stand up and act out this role

15. Active Demonstration - Results
Solids: particles vibrate in place
Liquids: particles move faster than in solid so they spread out more
Gas: particles move very fast so they are really far apart
Can you walk through ice, water, humid air?

16. Kinetic Theory of Matter
Matter is made of atoms and molecules
These act like tiny particles that are ALWAYS in motion
Particles move faster at higher temperatures
Bigger particles move slower than smaller ones AT THE SAME TEMPERATURE

17. Review States of Matter ( Volume & Shape )
Solids – definite shape and volume?
Liquids – definite shape and volume?
Gas – definite shape and volume?

18. Review States of Matter ( Volume & Shape )
Solids – definite shape and volume?
BOTH
Liquids – definite shape and volume?
ONLY VOLUME
Gas – definite shape and volume?
NEITHER

19. Solid, Liquid, Gas

20. Temperature Particles in all states of matter have kinetic energy
Temperature is a measure of the average kinetic energy of particles in an object

21. Conservation of Mass & Energy
Mass and Energy are both CONSERVED ALWAYS
Mass/Energy is neither created nor destroyed
This applies to state-changes also

22. Demonstration 2 ( Butter )
Of course you know this, but what happens when the butter is added to the hot water?
Why does this happen?
How does energy ( of both the water and the butter ) change during this process?
What happens to the particles in both the water & butter ( speed up or slow down ) ?

23. Practice - Study Guides
Pg 10 ( #s 1, 2, 5 )
Pg. 11 ( #s 1, 2, 3, 4 )

24. Challenge – In Your Notes
Fog: which of the 5 state-changes does fog represent?
When/Where does fog form
Is energy absorbed or released when fog forms?
Is energy and mass conserved when fog forms?

25. Exit Pass On a Whiteboard, make a table with 3 columns and 4 rows
list four ( 4 ) common, everyday examples of state-changes in first column
Put which of the 5 state changes they are in middle
List whether energy is released or absorbed on right

26. Exit Pass
Draw a picture that indicates a state-change ( you choose !! ) then label which of the 5 state-changes it is and whether energy is added or removed [from the substance changing].