Elements, Compounds & Mixtures

What this lesson covers

Elements, Compounds & Mixtures is a 10-part Class 7 Science lesson. Each part makes one point and then hands over to the next, so it can be read in a sitting or picked up again at the part you stopped on. It defines the idea in plain words before using it, works through an example step by step, breaks the topic into its parts and compares them, shows where it is used outside the textbook, names the mistakes that cost marks in an exam, ends with a recap of what to remember.

How it begins

All matter is made of atoms. An element is a substance made of only one kind of atom. There are about 118 elements. Oxygen, iron, carbon and gold are all elements, and none can be broken into anything simpler by chemical means.

The 10 parts

1. Atoms and elements
2. Compounds
3. New properties
4. Mixtures
5. Separating mixtures
6. Air, sea water and alloys
7. Telling them apart
8. Where marks go
9. What to remember
10. Watch one worked through