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The Fundamental Unit of Life Class 9 Notes Science Chapter 5 Facts that Matter The smallest functional unit of life is a cell, discovered by Robert Hooke in 1665. A cell can independently perform all necessary activities to sustain life. Hence cell is the basic unit of life. There are two types of cells plant [...]
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Structure of the Atom Class 9 Notes Science Chapter 4 CBSE Class 9 Science Notes Chapter 4 Structure of the Atom Facts that Matter John Dalton assumed that atom is indivisible. In 1866 E. Goldstein discovered the presence of new radiations in a gas discharge tube and called them canal rays. These rays were positively [...]
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Atoms and Molecules Class 9 Notes Science Chapter 3 Facts that Matter Law of Chemical Combination Given by Lavoisier and Joseph L. Proust as follows: 1. Law of conservation of mass: Mass can neither be created nor destroyed in a chemical reaction. e.g., A + B → C + D Reactants → Products Mass of reactants [...]
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Is Matter Around Us Pure Class 9 Notes Science Chapter 2 Facts that Matter Compounds The compound is a pure substance made up of two or more elements combined chemically in a definite ratio. Characteristics: The properties of compound differ from those of its constituents. Compound has fixed melting point and boiling point. Compound is [...]
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Matter in Our Surroundings Class 9 Notes Science Chapter 1 Facts that Matter Introduction Everything in this universe is made of materials which scientist has names ‘matter’. The matter is made up of very small tiny particles. It is not continuous but is particulate. The matter is anything that occupies space and has mass. Particles of matter [...]