Year 8 · Summer First Half
Chemistry
4 lessons from 2 units.
Unit C6 · lesson 7 of 7
An acid and an alkali are not things you can see, weigh or smell. They are things a substance does — to a dye, to a metal, to each other — and this unit is about reading those behaviours, predicting them, and using them on purpose.
Unit C8 · lessons 1 to 3 of 7
There are about ninety elements that occur on Earth, and for most of the nineteenth century nobody could say why some of them behaved alike. This unit is about the arrangement that answered it — what a column means, what a row means, and how a table can let you describe an element nobody has found yet.
- 07CatalystsModelA spatula of black powder turns a bottle that has been sitting still for a year into a reaction that is over in twenty seconds. Weigh the powder afterwards and none of it has gone.Open this lesson
- 01Metals and non-metalsContrastTwo grey solids, both dull, both heavy, and both of them conduct electricity. One is a metal and one is not — so which single test tells them apart?Open this lesson
- 02Mendeleev and the table that predictedModelMendeleev described an element nobody had ever seen, down to the density of the metal and the formula of its oxide, and fifteen years later somebody dug it out of a silver mine. How do you describe something that has not been found?Open this lesson
- 03Groups and periodsModelSodium explodes on water. Magnesium, the square next door, sits in it and barely fizzes. Potassium is two rows away and behaves exactly like sodium. So which tells you more about an element — its row or its column?Open this lesson
Back to all three sciences this half term The whole KS3 Chemistry course