1. Flora is boiling water on a stove. She turns the
temperature dial up to high to boil the water. The water
is boiling vigorously with large bubbles quickly forming
and bursting at the surface. Flora then turns the dial of
the stove down to low. The water is boiling gently, with
smaller bubbles slowly forming and bursting at the
surface. Flora wonders if the boiling temperature
changes when she turns down the dial. What would you
tell Flora?
A. The boiling temperature is greater when the dial is set
at high.
B. The boiling temperature is greater when the dial is set
at low.
C. The boiling temperature is the same at both settings.

2. Freezing Water
-15
-10
-5
0
5
10
15
20
25
0 2 4 6 8 10 12 14 16 18
Time (min.)
Temperature(C)
Liquid, cooling,
sensible heat
Freezing, latent
heat
Solid
Super cooled,
liquid
?

3. Water
The most important compound is
High surface tension
adhesion cohesion
Due to
Caused by

4. adhesion cohesion
External forces that makes Are internal forces because
Water sticks to
glass
meniscus
That’s why graduated
cylinders have
Water is polar
Negative Positive
The O side The H side

5. Density
Mass per unit
of volume
“Stuff”
“Space”
Is the
Mass is the
Volume is the
1.0 g/cm3
Float
Sink
Less than
Greater than
Water’s value is

6. High heat capacity
Heat
Ability to hold
Boiling and
freezing points
Causes H2O to
have extreme

7. 100o
C 212o
F
0o
C 32o
F
Boiling starts at
Freezing starts at

8. Heat
Sensible
Change of
state
Read by a
thermometer
Latent
Two types are
Can be
Causes

9. Density anomaly
Change during
phase changes
Means the
density will
Water
Yield a full
cup of water
That’s why
Ice floats in
A full cup of ice
will not

10. Density anomaly
Change during
phase changes
Means the
density will
Water
Yield a full
cup of water
That’s why
Ice floats in
A full cup of ice
will not