Leo+DadMade for Leo
← Change
Concept · 4 steps · NESA SC4-CHG-01

Chemical Change

The one line that splits all change in two: a chemical change makes genuinely new substances — a physical change doesn't. From spotting the tell-tale signs, all the way to reasoning backwards from rust, smoke and a browning apple. Four short steps, each with its own toy to play with.

1 Where it comes fromSome changes make genuinely new stuff. Sort events into physical or chemical and watch the tell-tale signs light up. 2 How to do itRead and write word equations, reactants → products, and the law underneath: conservation of mass. 3 Where it gets trickyDramatic isn't chemical, reversible isn't physical, and mass only seems to change when a gas sneaks in or out. 4 Out in the wildCombustion, cooking, rusting, even breathing — and reasoning backwards from a sign to "was this chemical?"
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