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Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: • Recall that the energy required to change the state of an object depends on its mass; there is no change in temperature while changing state. • Be able to perform calculations based on specific latent heat.

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Page 1: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Physics Unit 1Lesson A2: Part 1Changing State

Learning objectives:• Recall that the energy required to

change the state of an object depends on its mass; there is no change in temperature while changing state.

• Be able to perform calculations based on specific latent heat.

Page 2: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

In the backs of your books draw the particle diagrams for a solid, a liquid and a gas.

People will be asked to come up and draw their ideas on the board.

Solid Liquid Gas

Page 3: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Do you agree?

What are the important things to remember in each diagram?

Solid Liquid Gas

Page 4: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Check yours against the correct versions.

Draw the correct ones in the front of your books, with descriptions.

SolidRegular PatternTouchingNot moving - Vibrating

LiquidRandom PatternTouchingMoving Randomly

GasRandom PatternNot touching – Far apartMoving Randomly - Fast

Page 5: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Which words would we put in each arrow?

Solid GasLiquid

Boiling

Freezing

Melting

Condensing

Page 6: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Copy the correct diagram into your books.

Solid GasLiquid

Boiling

Freezing

Melting

Condensing

Page 7: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Describe the what this graph is showing – talk about each section

Time

Tem

pera

ture

A

B

C

DE

Page 8: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

If this graph was for water, two very important temperatures could be added. What are they?

Time

Tem

pera

ture

?

?

Page 9: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Were you right? What is important about 100oC and 0oC for water?

Time

Tem

pera

ture

100oC

0oC

Page 10: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

What is happening to the water in each section? Discuss with your partner

Time

Tem

pera

ture

A

B

C

DE

100oC

0oC

Page 11: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Which phrase goes with each section?

Time

Tem

pera

ture

A

B

C

DE

100oC

0oC

Ice is warming up

Ice is melting

Liquid water is warming up

Liquid water is Boiling

Steam is warming up

Page 12: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Which phrase goes with each section?

Time

Tem

pera

ture

100oC

0oC

Ice is warming up

Ice is meltingLiquid water is warming up

Liquid water is Boiling

Steam is warming up

Page 13: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

What happens to the temperature when the water is changing state?

Time

Tem

pera

ture

100oC

0oC

Ice is warming up

Ice is meltingLiquid water is warming up

Liquid water is Boiling

Steam is warming up

Page 14: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Draw this diagram very neatly in your books. Add more detail to the labels. Describe what is happening to the temperature in each section

Time

Tem

pera

ture

100oC

0oC

Ice is warming up

Ice is meltingLiquid water is warming up

Liquid water is Boiling Steam is

warming up

Page 15: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Recap Quiz – back of book1. What is the unit for Temperature?

2. What is the unit for Energy?

3. What direction does heat flow?

4. What is the melting point of water?

5. Describe the particles in a Solid.

6. What do you call the change of state from gas to liquid?

7. What happens to the particles in a liquid as you heat it?

8. What happens to the temperature of a material when it changes state?9. .

Page 16: Physics Unit 1 Lesson A2: Part 1 Changing State Learning objectives: Recall that the energy required to change the state of an object depends on its mass;

Answers – write a sentence in the front of you book to answer each question correctly

1. What is the unit for Temperature?oC (your sentence could be “The unit for temperature is oC”)

2. What is the unit for Energy?Joules (J)

3. What direction does heat flow?From hot objects (which cool down) to cold ones (which heat up)

4. What is the melting and boiling points of water?Melting = 0oC, Boiling = 100oC

5. Describe the particles in a Solid.Touching, in a regular pattern, vibrating, not moving around

6. What do you call the change of state from gas to liquid?Condensing

7. What happens to the particles in a liquid as you heat it?The particles move around faster.

8. What happens to the temperature of a material when it changes state?The temperature stays the same when it changes state.


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