Year 8 · Summer Second Half
Chemistry
4 lessons from 1 unit.
Unit C8 · lessons 4 to 7 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.
- 04Group 1 — the alkali metalsModelCut a lump of sodium and the fresh surface is a mirror for about four seconds, then dulls while you watch. Nothing touched it. What is attacking it?Open this lesson
- 05Group 7 — the halogensContrastGroup 1 got fiercer the further down you went. Group 7 is the same kind of column with the same kind of family — so does it do the same thing?Open this lesson
- 06Group 0 and why groups existModelArgon is one per cent of the air and has been going in and out of human lungs for as long as there have been lungs. Chemists analysed air for a century and missed it. How do you miss an element that common?Open this lesson
- 07Metal and non-metal oxidesContrastBurn a metal and burn a non-metal, drop each product into water, and the two solutions go opposite ways on the pH scale. The side of the table the element came from decides which way.Open this lesson
Back to all three sciences this half term The whole KS3 Chemistry course