1. Warm-Up
Take out your homework packet.
What questions do you want us to review?

2. States of Matter
Chapter 2
3. What happened when we rubbed the alcohol on our hands/desks??
4. What types of things can we do to change water into ice, steam, liquid??
5. Changes of State
Chapter 2; Section 2
6. I. Changes of State
Physical changes
Converting from 1 form to another
Change the energy of substances
7. Does ice or liquid water have more energy? (energy of motion)
Ice
Liquid
8. 1. Temperature
Measure speed of particles
Measure of energy(of motion)
Use a thermometer
9. Which has a higher temperature, steam or liquid water?
Steam
Liquid
10. Which has a higher energy, steam or liquid water?
Steam
Liquid
11. Make a Venn Diagram comparing liquid and gas with regards to state of matter, particle motion, temperature and energy.
12. Warm-Up
Share your Venn Diagram with your neighbor.
Talk about all the ideas you know and can explain about Liquids and Gases.
If time remains, talk about solids too
13. 2. Heat
Transfer energy
Cause change in temperature
14. 3. Endothermic vs Exothermic
ENDothermic = absorbs heat/energy
EXOthermic = releases heat/energy
15. Warm-Up
What is the difference between endothermic and exothermic reactions?
Give 1 example of each process.
16. Changes of State
17. A.Melting
Endothermic(Motion of molecules increases)
Solid to liquid
18. B.Freezing
Exothermic(Motion decreases)
Liquid to solid
19. C.Vaporization
Endothermic(Motion increases)
Liquid to gas
Boiling: throughout the liquid
Evaporation: on the surface
20. D.Condensation
Exothermic(Motion of molecules decreases)
Gas to liquid
21. E.Sublimation
Endothermic(Motion increases)
Solid to gas
22. Melting vs Freezing
Same temperature
Called the melting point
23. Tor FEvaporation can occur at any temperature.
TorFBoiling occurs only at the surface of a liquid.
TorFVaporization is simply a liquid changing to a gas.
24. Vaporization vs Condensation
Same temperature
Called boiling point
25. Warm-Up
What is mass?
Do you think changes of state affect mass?Why or why not?
26. What happened to the mass of the apparatus while it heated?
Why did the balloon inflate?
What state change occurred?
When a liquid turns to a gas, what happens to its mass? Volume? Density?
27. Warm-Up
What is the phase change that converts liquids to gases?
What is the name of the point at which this change occurs?
28. Warm-Up
At your table, share data and observations from the Hot-Cold lab with the people you sit with.
29. Warm-Up
In the Hot and Cold lab, what state change occurred with the ice buckets?
What did you do in that experiment to lower the freezing point of the ice below 0oC? (you do this all the time in the winter)
30. Water Phase Change Graph
Changing the state of water graph
E
D
100
gas
C
Temperature C.
liquid
B
0
A
solid
Heat (thermal energy)
Added
31. E
D
100
gas
C
Temperature C.
liquid
B
0
A
solid
Heat (thermal energy)
32. E
D
condensing
100
boiling
C
Temperature C.
B
freezing
0
melting
A
Heat (thermal energy)
33. Changes of state occur between B-C and D-E.What happens to the temperature during the state changes?
34. Phase Change Diagram
35. Warm-Up
Label the five arrows below with
The name of the change of state:
SOLIDLIQUIDGAS
sublimation
melting
vaporization
condensation
freezing
36. Warm-Up
What is the difference between condensation and vaporization?
Whatis similar between condensation and vaporization?
37. Warm up
Take out your Chapter 2 review sheet.
With your group members, arrange the arrows, pictures, and words to show the state changes of water.
38. Gas Laws Chapter 2 Test Review
39. Condensation
Freezing
EXOTHERMIC
EXOTHERMIC
ENDOTHERMIC
ENDOTHERMIC
Melting
Vaporization
ENDOTHERMIC
Sublimation
40. Internet Demos
41. Which law is it?Why?
42. Which law is it?Why?
43. Scientific Method
In a science experiment, you have several factors:
Constant:the item that is not changing throughout the experiment
Independent variable: The factor the scientist is changing
Dependent variable: The factor that changes because of the independent variable
44. Vacuum Pump Demo:
What 2 variables are being changed?
Which law is being demonstrated?
Why do you know?
45. Glove Demo:
What 2 variables are being changed?
Which law is being demonstrated?
Why do you know?
46. Pumpkin Demo:
Is this reaction endothermic or exothermic?
Why do you know?
47. State change graph:
A.
B.
C.
D.
E.
Is this graph endothermic or exothermic? Why?
What states are present at A, C, E?
What state changes happen at D, B?
48. Extension
How can you change the boiling point or freezing point of water?
(Hint: you probably do this and dont know exactly why!)
49. Warm-Up
Complete the exit slip on your desk.