What is the relationship between kinetic energy and

What is the relationship between kinetic energy and temperature?
Describe how particles move in a
solid.__________________________________
Describe how particles move in a liquid:
_________________________________
Describe how particles move in a gas:
__________________________________
What is the freezing point of water on the Celsius scale?_____ boiling
point? ______
In terms of energy how do you make something melt? How do you
make something freeze?
Data
Time
(minut
es)
Tempera
ture
(°C)
Time
(minut
es)
Tempera
ture
(°C)
Time
(minut
es)
Tempera
ture
(°C)
Time
(minut
es)
Temperatu
re
(°C)
0.5 5.5 10.5 15.5
1.0 6 11 16
1.5 6.5 11.5 16.5
2 7 12 17
2.5 7.5 12.5 17.5
3 8 13 18
3.5 8.5 13.5 18.5
4 9 14 19
4.5 9.5 14.5 19.5
5 10 15 20
Conclusions
Staple your graph to this sheet.
1) What happens to the temperature as the ice is melting?
__________________________________________________________________
______
2) What happens to the temperature once the water starts boiling?
__________________________________________________
_____________________
3) Describe in terms of kinetic energy what is happening to the
molecules as the temperature of the water increases.
__________________________________________________________________
__________________________________________________________________
____________

4) Compare the kinetic energies of a water molecule in a solid, in a
liquid and in a gas.
__________________________________________________________________
__________________________________________________________________
____________
5) Describe the path of energy and energy transformations from the
electric outlet to the ice.
__________________________________________________________________
__________________________________________________________________
____________
6) If the energy from the hotplate is not causing the temperature to
increase during the phase change, where is this energy going?
__________________________________________________________________
______

Changing of State Lab: Freezing
Objective: To determine what happens to the temperature of water as
it freezes
Materials
Test Tube 400 mL Beaker Thermometer
Ring Stand Ice Graduated Cylinder
Clamp Salt
Water Spoon
Procedure
1) Fill a 400 mL beaker 1/3 full with ice, then add 100 mL of water.
2) Put 5 mL of water into a test tube and use a clamp to fasten the
test tube to a ring stand. The tube should be clamped above the
water bath. Place the thermometer into the water inside the
tube.
3) Lower the test tube into the ice water bath.
4) Soon after lowering the test tube, add 5 spoonfuls of salt to the
beaker and stir with a spoon. Continue to stir the water bath
during the experiment.
5) Slightly move the thermometer during the first ten minutes of
the experiment. Keep the thermometer in the ice as it forms, not
above the ice. When 10 minutes have passed stop moving the
probe and allow it to freeze into the ice. Add more ice cubes to
the water bath as the original ice cubes get smaller.
6) When 15 minutes have passed, stop collecting data.
Analysis
Make a graph of temperature vs. time
1) What happens to the temperature of the water as it begins to
freeze?
2) Where is the energy in the water going as it freezes?
3) Why is the ice in the water bath melting, while the ice in the test
tube freezes?

Episode: Salsa Escape
Myth: Convicts in Mexico escaped their prison cell by using
salsa to corrode the bars away.
Topics of Discussion
-Reactivity of metals with acid
-Strength of acids (pH)
Classroom Integration Suggestions
-Salsa Heat Lab
-Salsa Ingredient Lab
-Acid pH Lab

“Salsa Escape”
Lab One:
Objective: To determine if the “hotness” of salsa affects the rate at
which it corrodes metal.