1. 10/7 & 10/8 - 8th Grade Agenda
Learning Objective: Learn about the boiling point & evaporation
Collect HW: Reading & Notetaking p.55-56
Pressurized Bell Demonstration
Video: Cosmos
Textbook Reading p
Hw: Reading & Notetaking p

2. Daily Reflection
Prompt: Why does molecules slow down when temperature goes down?

3. What are we measuring when we measure temperature?
Movement of Molecules
Solid
Liquid
Gas

4. What is the difference between these patterns?
Molecules form
Regular Pattern
Molecules form
Irregular Pattern
Crystalline solids
Amorphous solids

5. Solids that is made up of crystals in which particles are arranged in a regular repeating pattern is cr_______ solids
ystalline
Salts
Snow

6. Am_______ solids are made up of particles that are not arranged in regular pattern
orphous
Plastics

7. Crystalline vs Amorphous Solids
When a crystalline solid is heated, it melts at a specific temperature
Amorphous solid does not melt at a distinct temperature
Why?

8. What are properties of Solid molecules?
A solid keeps its own shape.
It doesn’t take the shape of a container
The particles vibrate back and forth within the solid

9. What are properties of Liquid molecules?
Liquid volume does not change, it takes the shape of whatever container you pour it into.
How do particles of liquid differ from the particles of a solid?

10. What are properties of gas molecules?
The particles of gas can be squeezed into a small volume.
If allowed to, they will spread out with limit.

11. The resistance of a liquid to flowing is called vi_______
scosity
Which has higher viscosity?
Syrup
Water

12. What is surface tension?
Surface ten______ is the result of an inward pull among the mole_______ of liquid that brings the molecules on the surface closer together.
Surface tension enables the ins______ to walk on the calm surface of a pond.
cules
ect

13. What is the temperature where a Solid turns into a Liquid called?
Melting Point

14. What is the temperature where a Liquid turns into a Gas called?
Boiling Point

15. Liquid water changing into water vapor is an example of va__________
porization

16. When vaporization takes place only on the surface of the liquid the process is called eva__________
poration

17. When vaporization takes place inside a liquid as well as at the surface, the process is called b_______
oiling

18. What happens to the Boiling Point when you go to higher elevation?
Boiling Point Depends on Air Pressure
In the city of Denver (1600 meters above sea level, water boils at 95 degrees Celsius)
That is why you have to boil longer at higher elevation.

19. Co_________ occurs when gas loses enough thermal energy to become a liquid.
ndensation
Occurs when a gas loses enough thermal energy to become a liquid: i.e. breathing onto a mirror.

20. limation
Sub_________ occurs when the surface particles of a solid gain enough energy to become a gas.
When the surface particles of a solid gain enough energy to become a gas without becoming a liquid.

21. What happens to Volume when Pressure is increased?

22. What happens to Volume when Pressure is decreased?
This is Boyle’s Law

23. Which cylinder has more pressure
Which cylinder has more pressure? What is happening to the volume of the cylinder with more pressure?

24. What is Boyle’s Law?
When the pressure of gas increased, the volume decreases.
When pressure decreased, the volume increases