Chemistry 11 · Chemistry · Lesson 5.1
Equations and the conservation laws
- Level
- Grade 11
- Reading time
- 13 min reading
- Review
- Last reviewed 2026-09-03
- Standard
- Accuracy standard
- Errata
Abstract
What a chemical equation shows and the laws it must obey.
Concept preview
What you will be able to do
- 01Recognise the signs that a chemical reaction has occurred
- 02Read the parts of a chemical equation
- 03State the four conservation laws that reactions obey
A chemical reaction occurs when starting chemicals form different chemicals. No single clue proves it, but several changes together give strong evidence: a temperature change, the appearance of a differently coloured material, or the formation of a new phase (a gas bubbling off or a solid appearing). When these are seen, chemists say the starting species have reacted to form new substances.
School Plan
Equations and the conservation laws
This lesson's full explanation, worked examples, quiz and practice are locked. Full access is on the School Plan.
Log in or start free and you will return right here.