Physical change
Shape, size or state changes; no new substance forms.
CLASS 7 • INTERACTIVE CLASSROOMChanges Around Us:
Changes Around Us:
Physical & Chemical
Become a Change Detective. Predict, experiment, explain and build mastery through TASK, SAKHA and NIYAM.
0%Mastery journey
Progress stays on this device during this session.
Chemical change
One or more new substances form through a reaction.
Evidence clues
Gas, colour, heat, light, smell or a new solid may be clues.
1
Change Detective
Classify everyday changes using scientific evidence—not guesswork.
Ice melts into water
Predict first, then choose the best answer.
2
Carbon Dioxide Reaction Lab
Create a gas, test it and follow the evidence.
Vinegar + baking sodaReady to mix
◯Lime waterClear
3
Build the Fire Triangle
Combustion begins only when all three requirements meet.
Triangle incomplete
Select fuel, oxygen and enough heat.
4
The Candle Mystery
One candle shows both physical and chemical changes.
5
Interactive Sessions
Learn with classmates through prediction, discussion, evidence and explanation.
YOUR GROUP CHALLENGE
Is dissolving sugar always a physical change? Defend your answer with evidence.
Choose your role
Predict
Predict silently and write one reason.
Discuss & Test
Compare explanations with your group. Look for the idea of a new substance.
Share
Share one claim, one piece of evidence and one question with the class.
6
Mastery Challenge
Answer five evidence-based questions. Aim for 4/5.
S
SAKHA Teach-Back
Explain the candle example to a younger learner in your own words.
Use the ideas: melting, physical, burning and new substance.
N
NIYAM 3-Day Revision Plan
Small, spaced practice is stronger than one long revision session.
Complete the Change Detective and note two evidence clues.
Teach the candle and fire-triangle ideas without looking.
Retake the mastery challenge and target at least 4/5.