Science

Physical and chemical properties

In Class 9 Science, this topic helps students distinguish physical properties—such as colour, state, density, solubility, melting point and boiling point—from chemical properties, which describe a substance’s ability to undergo reactions and form new substances. Linked to “Exploring Mixtures and Their Separation,” it shows how observing these properties helps identify components, choose suitable separation methods, and tell a physical change from a chemical change. Students practise careful observation, comparison, and evidence-based classification.