Lesson 2 of 13
What water can dissolve
Show on a big screenSugar and salt dissolve in water. They spread through the water and cannot be seen. Sand does not dissolve. Oil floats on top.
The rule
Water dissolves many things, such as sugar and salt. It does not dissolve everything, such as sand or oil. A substance may dissolve in one solvent but not in another.
| Substance | In water |
|---|---|
| Sugar | Dissolves |
| Salt | Dissolves |
| Baking soda | Dissolves |
| Chalk powder | Does not dissolve |
| Sand | Does not dissolve |
| Oil | Does not dissolve |
Grease will not dissolve in water. It does dissolve in kerosene. Oil dissolves in kerosene too. Sugar and salt do not dissolve in kerosene.
Some traditional medicines use oil or ghee as the solvent.
Pick a solvent and a material. Say if it dissolves. Then drop it in.
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Try the lab to finish this lesson.