Six short lessons build up how to recognise, describe and predict a chemical change — each with its own live simulation. Then a rusting investigation and ten practice questions tie it all together.
Go in order the first time — each lesson leans on the one before it. Every lesson has something to click, drag, or mix, so you're never just reading. Budget about 10 minutes a lesson.
The one question that decides everything: has a new substance formed?
Start → Lesson 2Why nothing is created or destroyed, and how to write a word equation.
Start → Lesson 3Combustion, thermal decomposition, oxidation — and what rusting actually needs.
Start → Lesson 4The pH scale, and how litmus and Universal Indicator reveal it.
Start → Lesson 5Acid + alkali, acid + metal, acid + carbonate — three reactions, three tests.
Start → Lesson 6The same reactions, helping us or costing us — it depends on context.
Start → The labThe classic Sec 2 investigation, live: three reference tubes plus one you control.
Open → PracticeFrom classifying a change up to word equations and the rusting investigation. Self-checking.
Practice →