NCERT SCIENCE (9TH CLASS) - 1 IMPORTANT CHAPTERS FROM NCERT SCIENCE CONTENTS CLASS PHYSICS CHAPTER CHEMISTRY CHAPTER BIOLOGY CHAPTER 9TH 8 9 10 11 12 1

NCERT SCIENCE (9TH CLASS) - 1 IMPORTANT CHAPTERS FROM NCERT...

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1 RAJESH NAYAK IMPORTANT CHAPTERS FROM NCERT SCIENCE CONTENTS CLASS PHYSICS CHAPTER CHEMISTRY CHAPTER BIOLOGY CHAPTER 9 TH 8, 9, 10, 11 & 12 1, 2, 3 & 4 5, 6, 7 & 13
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2 RAJESH NAYAK CHAPTER-1-MATTER IN OUR SURROUNDINGS Everything in this universe is made up of material which scientists have named “matter” which occupy space and have mass. Early Indian philosophers classified matter in the form of five basic elements the “Panch Tatva”– air, earth, fire, sky and water. Modern day scientists have evolved two types of classification of matter based on their physical properties and chemical nature. The particles of matter are very small they are small beyond our imagination. Particles of matter have space between them. Particles of Matter are Continuously Moving. With increase in temperature the kinetic energy of the particles also increases. Particles of matter intermix on their own with each other by getting into the spaces between the particles. Intermixing of particles of two different types of matter on their own is called diffusion. On heating, diffusion becomes faster. Matter around us exists in three different states solid, liquid and gas. These states of matter arise due to the variation in the characteristics of the particles of matter. The Solid State - have a tendency to maintain their shape when subjected to outside force. break under force but it is difficult to change their shape, so they are rigid. The Liquid State - liquids have no fixed shape but have a fixed volume. take up the shape of the container in which they are kept. flow and change shape, so they are not rigid but can be called fluid. solids, liquids and gases can diffuse into liquids. The rate of diffusion of liquids is higher than that of solids. This is due to the fact that in the liquid state, particles move freely and have greater space between each other as compared to particles in the solid state. The Gaseous State - highly compressible as compared to solids and liquids. Due to high speed of particles and large space between them, gases show the property of diffusing very fast into other gases. On increasing the temperature of solids, the kinetic energy of the particles increases. Due to the increase in kinetic energy, the particles start vibrating with greater speed. The energy supplied by heat overcomes the forces of attraction between the particles. The particles leave their fixed positions and start moving more freely. A stage is reached when the solid melts and is converted to a liquid. The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point .
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