1、 Unit 13The water planet (Warming up&Speaking)What is water?How much do you know about water?properties of waterWhat properties or characteristics do you know about water?colorlesstastelessodorless(无嗅的)three formsfeeling wetabsorbing heatdissolvinggiving off heatLets do some experiments to know some
2、 of the properties of water.Experiments exploration The piece of paper will cling to the cup.Because of the air pressure.A.Oil floats on the water.B.Water floats on the oil.Because of the different density and property of the two.The chalk will be dissolved.Because the water molecule is polar,it can
3、 break down both solids and gases.The ice cube put in the glass with freshwater will float in the water,while the one in salt water will float on the water.Because of the different density of the water.22nd,MarchWater Saving LogoIt takes a drop of water to make a ripple in the ocean,lets be that dro
4、p.Water is a must to life.Without water,life would not exist.Speakingelectricityclean and safe,benefit agriculturewater the plants/crops/vegetableswaste;benefithome usecook,clean,wash andflush the toilet;convenientindustryoperate the factory,but dirty water,smelly riverstransportgoods,but leak,terri
5、ble,oilentertainmentswimming,throw trash or rubbishExample:The water is being used for making electricity.And I think it is a good way to use water,because people need electricity to do many things.It makes our life easy and convenient.We can not imagine life without electricity.Also,water is clean,
6、safe and can be reused,though the dam sometimes will destroy the environment.Everyone can benefit a lot from this way of using water.HomeworkSummarize your group opinion and write a passage about advantages and disadvantages of how we use water.1.冰块ice cube 2.分子molecule 3.氢原子/氧原子hydrogen atom /oxygen atom4.特性property 5.物质substance6.固体、液体solid、liquid 7.密度density 8.溶解dissolve9.漂浮float 10.吸收absorb 11.释放give off 12.从受益 benefit from
