Physical and chemical change

Use particle rearrangement to decide whether a new substance forms, and see why atoms and mass are conserved in reactions.

⏱ 19 min❓ 8 questions

What you'll be able to do

✔I can explain the difference between physical and chemical change at the particle level
✔I can explain that atoms are rearranged, not created or destroyed, in a chemical reaction
✔I can use conservation of mass to calculate an unknown mass in a reaction

How this works

1Read the short explanations first — they teach you what you need before each question.
2Answer each question, then tap Check. A right answer moves you on automatically; if it's wrong, you'll see a friendly explanation of why.
3Finish all 3 steps to see your score — sign in and subscribe to unlock the full lesson and save it.

What's inside

8 questions and 1 quick teaching card, including:

🔘Multiple choice — Tap the answer you think is best, then check it.
✅Select all that apply — More than one can be right — pick every option that fits.

👪Grown-up tip: sit alongside younger learners for the first few lessons. Read the questions together and chat about the explanations — that's where the real learning sticks.

Curriculum: AC9S8U07