- Greet the learners.
- Ask them if they can remember what was discussed in the last lesson or lessons.
- Do a brief overview of the previous lessons on “Solutions and special mixtures. Ask your learners the following questions:
- When is a mixture also a solution?
Answer: When one substance dissolves into the other.
- What is the substance that we can see called?
- What substance has dissolved?
- Give an example of a soluble solute (solids).
Answers could include: Sugar (solute) can dissolve in water (solvent).
- What is a saturated solution?
Answer: When no more solute can dissolve in a solution – e.g. too much sugar in my tea.
- Give examples of insoluble substances?
Answers could include: Water and oil, oil-based paint and water, sand and water, curry powder and water.
- Tell learners that they are going to learn about dissolving today.
- Tell learners that they are going to learn about the difference between dissolving and melting.
- Tell learners that they are first going to look at a video clip to remind them how a solid, a liquid and a gas differ from each other. They are going to see how the states change, which means, when a substance changes from one state (e.g. solid) to another (e.g. liquid).
- Show VIDEO CLIP 1: States of matter: Solids, Liquids and Gases: funza Academy Science Videos for kids (3:00 min.).