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