SA1 Chemistry Points to Remember
SA 1 Chemistry Points to Remember During electrolysis of water hydrogen @ cathode and oxygen @ anode (in the ratio 2:1) Colour of potassium nitrate is yellow ; nitrogen di oxide is a brown fume formed during thermal decomposition of KNO 3 Gypsum, plaster of paris, blue vitriol(Cu SO 4 ), washing soda have water of crystallization Amalgam is a metal in Mercury Galvanization coating metal with Zn Lustrous non metal is Iodine Liquid non metal is Br Liquid metal is Hg pH is the measure of acidic or basic character of a medium It determines the amount of hydronium ion in the medium Oxidation is loss of electron ; reduction is gain Electrolysis is a redox reaction Na OH is formed from brine solution by Chlor alkali process Carbonates and bicarbonates liberate CO 2 when treated with an acid Very dilute Nitric acid gives hydrogen with Mg and Mn only Hydrogen is used in the preparation of Margarine and chlorine in making PVC and CFCs Thermit process is a highly exotherm