lightupscience(科學(xué))6b教學(xué)課件unit3dissolvingandseparatinglesson1dissolving共19張

1、Add sugar to water,The sugar will dissolve.To separate them,A problem to solve!第1頁，共19頁。dissolve(溶解)evaporate(蒸發(fā))Lesson 1 Dissolving第2頁，共19頁。Put a sugar cube into water. What will happen?I think the sugar cube will sink.I think the sugar cube will disappear.第3頁，共19頁。Put a potato and a sugar cube int

2、o water. Observe for 2 minutes. What can you see? Draw pictures.Some things dissolve in water. They become small particles. These particles mix with the water particles. Some things do not dissolve.第4頁，共19頁。What happens to the sugar?I think the sugar is still there. But we cannot see it.Lets do an e

3、xperiment!第5頁，共19頁。You needscaleswatersugar cubespoon第6頁，共19頁。What to do1Put the beaker of water and the sugar cube on the scales. Measure the mass.2Put the sugar cube into the beaker. Stir.3Put the beaker on the scales. Measure the mass.Mass 1 is _ g.Mass 2 is _ g.第7頁，共19頁。ResultsIs Mass 1 equal to

4、 Mass 2? ( Yes / No ).ConclusionWhen the sugar cube dissolves, the sugar ( is / is not ) in the water. You cannot see it, but you can weigh it.第8頁，共19頁。The sugar cube dissolved. How can you separate the dissolved sugar from the water?1Put three spoonfuls of the liquid into a small dish.第9頁，共19頁。2Put

5、 the dish in a warm and sunny place.第10頁，共19頁。ResultsAfter two days, observe the dish. What can you see? Draw a picture.What does it taste like? Does it taste like sugar?Heat will evaporate the water. This will separate the dissolved sugar from the water.第11頁，共19頁。Some things dissolve in water. Some

6、 things do not dissolve. When the sugar cube dissolves in the water, we cannot see it, but we can weigh it.Heat will separate the dissolved sugar from the water.第12頁，共19頁。I measured the mass of an object.I put things in order.I did experiments.第13頁，共19頁。Which dissolves in water? Tick (). saltsandstonesoil第14頁，共19頁。Workbook第15頁，共19頁。Dissolve 5 g of salt in a 50 g beaker of water. What is the new mass? Tick ( ).45 g50 g55 g5 g50 g第16頁，共19頁。Which beaker