We do: the first change together — Lesson 7 — Observing Chemical Change (Demonstration Task)

We'll do the first change together so the routine is clear — then you're on your own for the rest.

#	Change	Watch for…
1	Melting butter	Does it stay the same substance?
2	Toasting bread	Colour change? Smell? New substance?
3	Popping popcorn	What changes — and can it go back?
4	Melting then refreezing ice	Reversible loop
5	Tearing vs burning paper	Which one makes a new substance?