Explain what happens to particles during dissolving

In this lesson, we will learn what happens to particles during dissolving. We will investigate what happens when we mix water with salt, sugar and sand. For this lesson you will need a pencil and a piece of paper. If you would like to take part in the practical you will also need a glass of water and some sugar and salt. If you do not have these things then you can still take part in the lesson by watching the teacher's demonstration.