Transcript
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:
Today’s Objectives: I can define heat and classify a phase change as either endothermic or exothermic.
85%
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:
Today’s Objectives: I can define heat and classify a phase change as either endothermic or exothermic.
87%
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:
Today’s Objectives: I can define heat and classify a phase change as either endothermic or exothermic.
97%
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:
Today’s Objectives: I can define heat and classify a phase change as either endothermic or exothermic.
97%
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
Launch 3/2
2. The random molecular movement is greatest in
a. ice
b. a liquid c. evaporation d. a gas
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
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!
March Schedule
Exam!
Today
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!
What is heat? Mr. Heffner
3/2/10
What is heat? Heat is…
the amount of energy that is transferred to a substance
Heat and temperature are different!
Flows from hot to cold.
What is heat?
0°C
100°C
Tem
pera
ture
Heat
Ice Melting takes energy because bonds need be broken.
Melting Water
Evaporation
Evaporation takes energy because bonds need be broken.
Steam
What is heat?
Endothermic processes… absorb heat
endo = into
therm = heat
Examples: melting, evaporation
Exothermic processes… release heat
exo = exit
Examples: condensation, freezing
Both release energy because bonds are formed.
Foldable Define the following terms, then draw a picture on
the inside of the flap: Heat Temperature Endothermic
Exothermic Melting
Evaporation Condensation Freezing
Practice Questions Practice question worksheet
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!
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.
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.
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
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
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
Homework Finish practice questions
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