1. Launch: 3/2
 Grab your binder and immediately take a seat!
 Place launch paper and practice questions on your desk.
 Yesterday’s Exit Slip Data:
85%
 Today’s Objectives: I can define heat and classify a phase
change as either endothermic or exothermic.

2. Launch: 3/2
 Grab your binder and immediately take a seat!
 Place launch paper and practice questions on your desk.
 Yesterday’s Exit Slip Data:
87%
 Today’s Objectives: I can define heat and classify a phase
change as either endothermic or exothermic.

3. Launch: 3/2
 Grab your binder and immediately take a seat!
 Place launch paper and practice questions on your desk.
 Yesterday’s Exit Slip Data:
97%
 Today’s Objectives: I can define heat and classify a phase
change as either endothermic or exothermic.

4. Launch: 3/2
 Grab your binder and immediately take a seat!
 Place launch paper and practice questions on your desk.
 Yesterday’s Exit Slip Data:
97%
 Today’s Objectives: I can define heat and classify a phase
change as either endothermic or exothermic.

5. Launch 3/2
1. Using your notes from yesterday (or from
memory), list the four phase changes in
the correct places.
Gas Gas
Liquid Liquid
Solid Solid

6. Launch 3/2
2. The random molecular movement is
greatest in
a. ice
b. a liquid
c. evaporation
d. a gas

7. Launch 3/2
3. Ice is placed on a stove and heated for 10
minutes until it changes into a gas. It is
then collected and cooled to become pure
liquid water. Which of the following
correctly identifies the phase changes in
the correct order?
a. evaporation, condensation
b. melting, evaporation, freezing, condensation
c. condensation, melting, evaporation, freezing
d. melting, evaporation, condensation

8. Announcements
 Unit #8: Thermodynamics
 New unit
 Start fresh
 Exam next Friday
 Short unit = short test
 25 MC
 No school this Thursday!
 College tour essay is due this Friday!

9. March Schedule
Today
Exam!

10. Opening
 Today’s Objective: I can identify the four phase
changes that occur between the states of matter.
 Standard – CH.7.a, CH.7.b, & CH.7.c
Today’s Question: I can define heat and classify a
phase change as either endothermic or exothermic.
Bill Nye!

11. What is heat?
Mr. Heffner
3/2/10

12. What is heat?
 Heat is…
 the amount of energy that is transferred to a substance
Flows from hot
to cold.
Heat and temperature are different!

13. What is heat?
Evaporation takes energy
because bonds need be broken.
Steam
Temperature
Evaporation
100°C
Water
Melting
0°C
Ice Melting takes energy because
bonds need be broken.
Heat

14. What is heat?
 Endothermic processes…
 absorb heat
 endo = into
 therm = heat
 Examples: melting, evaporation
 Exothermic processes…
 release heat Both release energy because
bonds are formed.
 exo = exit
 Examples: condensation, freezing

15. Foldable
 Define the following terms, then draw a picture on
the inside of the flap:
 Heat
 Temperature
 Endothermic
 Exothermic
 Melting
 Evaporation
 Condensation
 Freezing

16. Practice Questions
 Practice question worksheet

17. Closing
 Today’s Objective: I can identify the four phase
changes that occur between the states of matter.
 Standard – CH.7.a & CH.7.c
Today’s Question: What is a phase change?
Bill Nye!

18. Exit Slip
1. What is heat?
a. the amount of kinetic energy in a substance
b. the amount of movement in a substance
c. how hot a substance feels
d. the amount of energy transferred from one substance to
another.

19. Exit Slip
2. Endothermic processes
a. release energy.
b. occur when energy is transferred from a cold
substance to a hot substance.
c. absorb energy.
d. occur when chemical bonds are formed.

20. Exit Slip
3. Which of the following is an example of an
exothermic process?
a. evaporation
b. a liquid turning into a gas
c. melting
d. freezing

21. Exit Slip
4. A gas is changed into a liquid. What type
of process would occur?
a. exothermic
b. endothermic
c. homogenous
d. both a & b

22. Exit Slip
5. A solid is changed into a liquid.
Afterwards, it is cooled and changed back
into a solid. Which processes does the
sample undergo?
a. 2 exothermic processes
b. 2 endothermic processes
c. an exothermic process, then an endothermic process
d. an endothermic process, then an exothermic process

23. Homework
 Finish practice questions