1. 6th Grade: Matter and Energy (Module H)
Unit 1 Lessons 4 & 5

2. Kinetic Theory of Matter
Unit 1 Lesson 5 States of Matter
Kinetic Theory of Matter
“All matter is made of tiny particles that are in constant motion”
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4. Read and do page 66-67
Video: Does hot water freeze faster than cold water -

5. Unit 1 Lesson 5 States of Matter
How does particle motion affect the properties of solids, liquids, and gases?
What state of matter is shown in the image below? How do you know?
Video: Does hot water freeze faster than cold water -
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6. Liquids: Crash Course Chemistry –

7. A Change of State
Unit 1 Lesson 5 States of Matter
By adding or removing heat (energy), we can change the state of matter from one form to another
This does not change the identity of the substance, just the appearance
Read page 71
Do page 70 together (BEFORE NEXT SLIDE!)
Then READ page 76
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8. What happens when substances change state?
Unit 1 Lesson 5 States of Matter
What happens when substances change state?
What change of state is happening in this diagram?
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9. Changes of State 1. Freezing – liquid becomes a solid
Unit 1 Lesson 5 States of Matter
1. Freezing – liquid becomes a solid
Take away heat (substance loses energy) particles slow down, lock into fixed arrangement
The TEMPERATURE at which something changes from liquid to solid is called freezing point
Read and do page 78
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10. Changes of State 2. Melting - solid becomes a liquid
Unit 1 Lesson 5 States of Matter
Changes of State
2. Melting - solid becomes a liquid
Add heat, speed up vibrations in particles
Attraction between particles decreases, particles slide past each other
The TEMPERATURE at which substances change from solid to liquid is called melting point
Read and do page 79
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11. Changes of State 3. Evaporation – liquid becomes gas
Unit 1 Lesson 5 States of Matter
Changes of State
3. Evaporation – liquid becomes gas
Add heat, speed up vibrations in particles
Particles get enough energy that they ESCAPE from the surface!
4. Boiling–liquid becomes gas/vapor QUICKLY
Happens throughout whole liquid, not just surface
The TEMPERATURE at which this occurs is the boiling point
Read and do page 80
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12. Unit 1 Lesson 6 Changes of State
How does evaporation differ from boiling? Which of these processes is represented here?
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13. Changes of State 5. Condensation – gas becomes liquid
Unit 1 Lesson 5 States of Matter
5. Condensation – gas becomes liquid
Gas is cooled, particles loose energy
Particles stick together
Read and do page 81
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14. Changes of State 6. Sublimation – solid becomes gas Less common
Unit 1 Lesson 5 States of Matter
Changes of State
6. Sublimation –
solid becomes gas
Less common
Ex. Ice in freezer, or dry ice
Read and do page 82 and 83
7. Deposition –
gas becomes solid
Ex. Snowflakes!
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15. What happens when matter changes state?
Unit 1 Lesson 6 Changes of State
What happens when matter changes state?
Where in this diagram do water particles gain energy from the environment? Where do they lose energy?
Do page 77 – the whole page
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16. Good quiz questions!
When matter changes from one state to another … …does its identity change? … does its mass change? … does its physical state change? … does its appearance change?
Do page 84 (bottom) in class
Do page 85 (bottom) in class