1、整理課件cold(冷的冷的)dissolve(溶解溶解)stir(攪拌攪拌)warm(溫暖的溫暖的)Lesson 2 Dissolving Faster整理課件How can the sugar cube dissolve faster?We can use warmer water.We can stir the water.We can use colder water.We can crush the sugar cube.整理課件How can you make the sugar cube dissolve faster? Draw your ideas.整理課件Does the s

2、ugar cube dissolve faster in warmer water or colder water?1Get a beaker of warm water and a beaker of cold water. Both beakers should have the same amount of water.2Put a sugar cube into each beaker. Start the timer.AABB整理課件When does the sugar cube dissolve? Record the time.The sugar cube dissolves

3、faster in ( warmer / colder ) water.Beaker ABeaker BTime 整理課件Does the sugar cube dissolve faster with stirring or without stirring?1Get two beakers with the same amount of warm water.CD整理課件2Put a sugar cube into each beaker. Start the timer.3Stir one beaker regularly. Do not stir the other beaker.CC

4、DD整理課件When does the sugar cube dissolve? Record the time.The sugar cube dissolves faster ( with / without ) stirring.Beaker CBeaker DTime 整理課件Does the sugar cube dissolve faster as a cube or as small grains?1Get two beakers with the same amount of warm water.2Put a sugar cube into one beaker. Put a

5、crushed sugar cube into the other beaker. Start the timer.EEFF整理課件When does the sugar dissolve? Record the time.The sugar cube dissolves faster as ( a cube / small grains ).Beaker EBeaker FTime 整理課件How can things dissolve faster? Sing the song.When sugar is added to water, I stir it and it disappear

6、s.I cant see the sugar in water, but I know it is really here.Dissolve, dissolveThe sugar is really here, just here.Dissolve, dissolveI know that the sugar is here.To make things dissolve even faster, we use water that is warm.If we stir and use small grains of sugar, dissolving will speed up a lot.

7、Dissolve, dissolveIs faster when water is warm, is warm.Dissolve, dissolveIs faster if we stir a lot.It speeds up dissolving a lot.整理課件A sugar cube dissolves faster in warmer water.A sugar cube dissolves faster with stirring.A sugar cube dissolves faster as small grains.整理課件I did fair tests.I made predictions.I made models.整理課件整理課件Marys mum is cooking with salt. How can you help her dissolve the salt