Presentation on theme: "Unit 3: Heat and Temperature. Big Idea 1.0 Heat causes matter to change Many changes in matter are caused by heat Ex putting ice cubes into warm soup;"— Presentation transcript:
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) 1.Solid 2.Liquid 3.gas
Heat can cause a change in the state of matter Changes include: 1.Freezing: liquid changes into a solid 2.Melting: Solid changes into a liquid 3.Evaporation: Liquid changes into a gas 4.Condensation: Gas changes into a liquid 5.Sublimation: Solid changes into a gas
Water Freezing/ melting point= 0 o C (liquid to solid) Boiling / condensation point= 100 o C (liquid to gas)
Sulphur Solid to liquid at 113 o C Liquid to Gas at 445 o C Most often found as a solid in nature
Mercury Changes from solid to liquid at -39 o C Changes from liquid to gas at 357 o C Most often found as a liquid in nature
Chlorine Solid to liquid at -101 o C Liquid to gas at -35 o C Generally exists as a gas in nature
A ‘cool’ heat challenge Melt an ice cube as fast as you can. Here are the rules: 1.You can only use what is at your desk right now 2.You must collect as much melted ice as possible 3.You can’t put it in your mouth Answer these questions 1.How did you melt the ice? 2.Why did you choose this? 3.Did any strategies work better? Why? 4.If you could do this again what would you change? 5.If you could use anything to melt the ice, what would you use? How would it change your results?