Chemical change
Some substances disappear: the reactants. New substances appear: the products. It is written reactants products, the arrow reading "gives".
Recognise a chemical change, name what disappears and what appears, and the two identification tests to know.
Members only
Members only
Members only
Members only
Members only
Members only
The detailed method, the classic pitfalls and the self-check questions need an account. An email is enough, no password.
Free, and it takes thirty seconds.