Balancing Equations

No atom created or destroyed

An interactive lesson with 7 steps, about 6 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Reactions rearrange atoms: each element must balance.
• Change coefficients (how many), never subscripts (what).
• Total mass is conserved.

Steps

1. Atoms change partners
2. Make water
3. A tempting shortcut
4. Burning methane
5. Count the oxygen
6. Mass is conserved
7. Propane