2Big Idea 1.0 Heat causes matter to change Many changes in matter are caused by heatEx putting ice cubes into warm soup; drying clothes in the sun; putting water in the freezerMatter can exist in three forms: (states of matter)SolidLiquidgas
3Heat can cause a change in the state of matter Changes include:Freezing: liquid changes into a solidMelting: Solid changes into a liquidEvaporation: Liquid changes into a gasCondensation: Gas changes into a liquidSublimation: Solid changes into a gas
5Water Freezing/ melting point= 0oC (liquid to solid) Boiling / condensation point= 100 oC (liquid to gas)
6Sulphur Solid to liquid at 113 oC Liquid to Gas at 445 oC Most often found as a solid in nature
7Mercury Changes from solid to liquid at -39 oC Changes from liquid to gas at 357 oCMost often found as a liquid in nature
8Chlorine Solid to liquid at -101 oC Liquid to gas at -35 oC Generally exists as a gas in nature
9A ‘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 nowYou must collect as much melted ice as possibleYou can’t put it in your mouthAnswer these questionsHow 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?