1. 1. Is it a chemical or physical
change when you make
scrambled eggs? Why?
2.If I mix baking soda with
vinegar and a gas is
produced, is that a chemical
or physical change? Why?

2. Demos… (Before)
Make some qualitative observations.
What do you think will happen?
Explain.

3. Demos…
Make some qualitative
observations.
What happened? Explain.

4. Demos…

5. States of Matter
Chapter 2

6. • Dip a Q-tip in the rubbing
alcohol
• Rub the Q-tip on the back of
your hand
• What observations can you
make about this process?

7. 4 States of Matter
• Chapter 2; Section 1

8. I. States of Matter
• Physical form of a substance
• 4 states of matter

9. Why does the air freshener smell
up the entire room over time?

10. • Matter is made of atoms &
molecules; They are ALWAYS
moving
• STATES OF MATTER= changes
in Speed & attraction of the
molecules

11. A. Solids
• Definite shape and volume
• Particles close together

12. • Strong attraction
• Particles vibrate in place

13. 1.What ways are solids,
liquids, and gases
different?

14. B. Liquids
• Change shape NOT volume
• Take the shape of the container

15. • Molecules slide around
• Difficult to squeeze together

16. Gels?
• Liquids that have tiny solids
suspended in them
• Elastic properties

17. 1.Take out your Review Sheet
2.What are 2 things you learned
in chapter 1?
3.What is 1 thing you don’t
understand?

18. 1.How do molecules move in
solids?
2.How do molecules move in
liquids?
3.How tightly packed are the
molecules in solids and
liquids?

19. Demos…(After)
Make some qualitative
observations.
What happened? Why?

20. Demos…
What is happening in the
flask? Why-is it a chemical
change or a physical
change? Explain.

21. • Drop 2 drops of food coloring
into the flour on the plate
• Put the clean toothpick into 1
drop
• Put the toothpick dipped in soap
into the other drop
• What observations did you
make?

22. 1. Surface Tension
• Force causing liquids to form
spherical drops

23. 2. Viscosity
• Liquid’s resistance to flow

24. C. Gases
• Change shape and volume
• Move so fast they break apart

25. • Less attraction
• Empty spaces

26. • What did you observe about the
2 containers?
• Why did it take longer for the lid
to pop off one of them?

27. 1. Pressure
• Force on an area
• Number of collisions of particles
against the container

28. D. Plasmas
• No definite shape or volume
• Molecules are broken apart

29. • Conduct electricity; affected by
electric and magnetic fields

30. 1.What are the properties that
describe a liquid?
2.What are the properties that
describe a gas?

31. II. Gas Laws
• Gases show big volume
changes
• Based on pressure and
temperature

32. A. Boyle’s Law
• For a fixed amount of gas at a
constant temperature, the
volume of a gas increases as its
pressure decreases
• Volume decreases as pressure
increases

33. B
o
y
l
e
’
s
O
p
p
o
s
i
t
e
P
r
e
s
s
u
r
e
If P then V
If P then V

34. • Observe the balloons inside the
beakers.
• What do you notice happening
to each?
• Explain why one gets larger
while one gets smaller.

35. B. Charles’s Law
• For a fixed amount of gas at a
constant pressure, volume
increases as temperature
increases
• Also, volume decreases as
temperature decreases

36. C
h
a
r
l
e
’
s
S
a
m
e
T
e
m
p
e
r
a
t
u
r
e
If T then V
If T then V

37. ?????
• One of your friends over inflated
the tires on their bicycle. Use
Charles’s Law to explain why
they should let out some of the
air before going for a ride on a
hot day.

38. 1.What does Boyle’s Law mean?
2.Why does volume increase when
you decrease pressure?

39. The Can Crusher
• Observe the experiment.
• Why did the can crush??????

40. Hmm…
• Why does popcorn pop?

41. Recap…

42. 1.What can you observe about the
2 experiments?
2.Explain what is actually
happening to cause each.