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Some Basic Concepts of Chemistry

Nature of matter, law of chemical combination, Dalton’s atomic theory: concept of elements, atom and molecules Atomic and molecular masses, mole concept and molar mass, percentage composition, empirical and molecular formula, chemical reactions, stoichiometry and calculation based on stoichiometry

11th Chemistry NCERT notes

Stoichiometry and Stoichiometry Calculations

The word ‘stoichiometry’ is derived from two Greek words – Stoicheion (meaning element) and metron (meaning measure). The study of chemical reactions and...
11th Chemistry NCERT notes

Mole Concept

Dalton’s Atomic Theory The origin of the idea that matter is composed of small indivisible particles called ‘a-Tomio’ (meaning — indivisible). In 1808, Dalton published...
11th Chemistry NCERT notes

Laws of Chemical Combinations

Laws of Chemical Combinations The combination of elements to form compounds is governed by the following five basic laws. Law of conservative of mass Law...
11th Chemistry NCERT notes

Significant Figures

Significant Figures The reliability of a measurement is indicated by the number of digits used to represent it. To express it more accurately we express...
11th Chemistry NCERT notes

Matter, Measurement, SI Unit

Chemistry is the branch of science that deals with the composition, structure and properties of matter. Chemistry is called the science of atoms and...