1. Unit 3: Heat and Temperature

2. Big Idea 1.0 Heat causes matter to change
Many changes in matter are caused by heat
Ex putting ice cubes into warm soup; drying clothes in the sun; putting water in the freezer
Matter can exist in three forms: (states of matter)
Solid
Liquid
gas

3. Heat can cause a change in the state of matter
Changes include:
Freezing: liquid changes into a solid
Melting: Solid changes into a liquid
Evaporation: Liquid changes into a gas
Condensation: Gas changes into a liquid
Sublimation: Solid changes into a gas

5. Water Freezing/ melting point= 0oC (liquid to solid)
Boiling / condensation point= 100 oC (liquid to gas)

6. Sulphur Solid to liquid at 113 oC Liquid to Gas at 445 oC
Most often found as a solid in nature

7. Mercury Changes from solid to liquid at -39 oC
Changes from liquid to gas at 357 oC
Most often found as a liquid in nature

8. Chlorine Solid to liquid at -101 oC Liquid to gas at -35 oC
Generally exists as a gas in nature

9. A ‘cool’ heat challenge
Melt an ice cube as fast as you can. Here are the rules:
You can only use what is at your desk right now
You must collect as much melted ice as possible
You can’t put it in your mouth
Answer these questions
How did you melt the ice?
Why did you choose this?
Did any strategies work better? Why?
If you could do this again what would you change?
If you could use anything to melt the ice, what would you use? How would it change your results?