phy chemistry 11 english part 2

  CBSE Class 11 Chemistry Revision Notes Chapter 1 Some Basic Concepts of Chemistry Importance and Scope of Chemistry Nature of Matter Laws of Chemical Combinations Dalton’s Atomic Theory Atomic and Molecular Masses Stoichiometry and Stoichiometric Calculations Some Important Points and Terms of the Chapter 1.  Anything which has mass and occupies space is called matter. 2.  Matters exist in three physical states viz. solid, liquid and gas.  3.  In solids, these particles are held very close to each other in an orderly fashion and there is not much freedom of movement. In liquids, the particles are close to each other but they can move around. However, in gases, the particles are far apart as compared to those present in solid or liquid states and their movement is easy and fast. 4.  Solids have definite volume and definite shape.  5.  Liquids have definite volume but not the definite shape. They take the shape of the container in which they are placed.  6.  Gases have neither definite