Year 8 · Autumn First Half
Chemistry
4 lessons from 1 unit.
Unit C4 · lessons 1 to 4 of 5
Some changes make something new and some only move what was already there. This unit is about telling which is which, seeing what a reaction does to the atoms underneath, and learning the two ways chemists write one down.
- 01Chemical change vs physical changeContrastTwo changes can look identical — the same heat, the same colour change, the same disappearing solid — and only one of them makes something new. Which question separates them every time?Open this lesson
- 02Reactions rearrange atomsModelA new substance appears where two old ones were. Nothing was added and nothing left — so what actually happened?Open this lesson
- 03Word equationsModelHow do chemists write down a reaction so that nothing important is left out?Open this lesson
- 04Mass in a reactionQuantitativeOne reaction on a balance loses two grams and another gains one and a half. Both obey the same rule — so what is the balance actually telling you?Open this lesson
Back to all three sciences this half term The whole KS3 Chemistry course