Class 7 NCERT • Curiosity Science Portal
Ch 05: Changes Around Us: Physical and Chemical
Select a topic or study module below to explore physical vs chemical changes, the lime water test, combustion and the fire triangle, reversible vs irreversible changes, rock weathering, NCERT solutions, and quizzes.
Topic 01 • Physical Changes
Changes in Shape, Size & State of Matter Without Forming New Substances
Topic 02 • Chemical Changes
Formation of New Substances: Vinegar + Baking Soda, Milky Lime Water & Rusting
Topic 03 • Combustion & Fire Triangle
Fuel, Oxygen & Ignition Temperature, Fireflies & Physical + Chemical Candle Changes
Topic 04 • Reversible vs Irreversible
Reversible vs Irreversible Changes & Desirable vs Undesirable Everyday Changes
Topic 05 • Weathering & Erosion
Physical & Chemical Weathering of Rocks into Soil & Erosion by Wind and Water
Module 06 • Solutions & HOTS