1. Matter- Physical Transformations

2. Review from last class…
Bill Nye- Phases of Matter (Finish correcting)

3. Phases of Matter- Changes

4. Phases of Matter- Transformations
Energy (heat) causes matter to change state
By adding energy you can change solidsliquids and liquidsgases
By removing energy you can change gasesliquids and liquids solids

5. Phase Changes: Adding Energy
Solid  Liquid: Melting
Temperature at which it changes is called Melting Point
Liquid  Gas: Boiling/Evaporating
Temperature at which it changes is called Boiling Point
Adding energy speeds up molecules and increases their movement

6. Phase Changes: Removing Energy
Gas  Liquid: Condensation
Same temperature as the Boiling point
Liquid  Solid: Freezing
Same temperature as the Melting point
Removing energy causes the particles to slow down and decreases their movement

7. Phase Changes: Solids to Gases
Some solids can completely “skip” the liquid phase and change from solid gas or from gas solid
This is called Sublimation and Deposition
Iodine:
Dry Ice:

8. Physical Transformations
Any change of state (phase) is considered a physical transformation
The composition of the molecule doesn’t change just what state it is in
Ex: Ice is made of H2O molecules, when heated, the H2O molecules stay H2O, only the speed they are moving and their positioning changes

9. Heating Curve for Water
The flat line on a heating curve represents a change of state
The sloped line on a heating curve represents a change in temperature

10. Learning Check 1 A. Water condenses at a temperature of
1) 0°C 2) 50°C 3) 100°C
B. At a temperature of 0°C, water
1) freezes 2) melts 3) changes to a gas
C. When a gas condenses, heat is
1) applied 2) removed

11. Solution 1 A. Water condenses at a temperature of 3) 100°C
B. At a temperature of 0°C, water
1) freezes 2) melts
C. When a gas condenses, heat is
1) removed

12. Learning Check 2
Is energy applied (1) or removed (2) in each of the following:
____A. Ice to liquid water
____B. Water vapor to rain
____C. Water to ice
When it rains, the air becomes
1) warmer 2) cooler 3) does not change

13. Solution 2
Is energy absorbed (1) or released (2) in each of the following:
A. Ice to liquid water 1
B. Water vapor to rain 2
C. Water to ice
When it rains, the air becomes
1) warmer

14. Learning Check 3 Complete using the terms gains or loses
In the cooling coils of a refrigerator, liquid Freon ___________ heat from the food and changes to a gas
Food ___________heat and becomes colder
In the back of the refrigerator, Freon _________ heat and condenses back to a liquid

15. Solution 3 Complete using the terms gains or loses
In the cooling coils of a refrigerator, liquid Freon gains heat from the food and changes to a gas
Food loses heat and becomes colder
In the back of the refrigerator, Freon loses heat and condenses back to a liquid

16. Worksheet- Physical Transformations
On the back side of the “Phases of Matter-Bill Nye” sheet
Complete the questions and hand in to the pass in bin