Matter in our surrounding class 9th by shveta, Study notes of Chemistry

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Date 17 June 2026 Chapter 1 Matter in our surrounding Everything is matter. Which can occupy space and have mass. Classification of matter + solid. + element + liquid. + mixture ‘gas * compound Physical nature of matter 1. Matter is made up of particles. 2. Particles are very small. Characteristics of matter 3. Matter of particles space between them . 4. Particles are attract to each other . 5. Matter of particles continuously moving they passes kinetic energy. State of matter 1. Solid Have definite shape and volume. Particles are very closely pack . Strong intermolecular force. 2. Liquid Have not definite shape but fixed volume. Particles are free move to sufficient space. Weak intermolecular force 3. Gas Indefinite shape and volume. Particles are very free move they are large space in. Very weak intermolecular force. Effect of matter of temperature j Any substance provide temperature they change its state . Ice fusion into liquid. Liquid vapour into gas . gas condensation into liquid. Liquid freezing into ice . Can matter change its state Yes , matter change its state. 1. Solid as ice 2. Liquid as water 3. Gas as water vapour Effect of Change of pressure « Evaporation cause cooling | 1. Surface molecules absorb heat 2. Increase kinetic energy of molecules. Ae Pa toe ns es ee ae era eae nek e Evaporation cause cooling 1. Surface molecules absorb heat 2. Increase kinetic energy of molecules. 3. Overcome force of attraction. 4. Escape out into gas / water vapour. 5. Decrease the kinetic energy of remaining molecules cause cooling. e Latent heat the heat energy is supplied to change the state of substance. e Sl unit and symbol.. Complete lesson