SA1 Chemistry Points to Remember

SA1 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 KNO3 
  • Gypsum, plaster of paris, blue vitriol(Cu SO4), 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 CO2 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 exothermic reaction so used for welding railway tracks
  • Carbonates ore are clacinated and sulphide ores are roasted to convert the ore to their oxide form
  • Electrolytic reduction is used to extract metal high in the activity series
  • Cinnabar is the sulphide ore of mercury and Zinc blend that of zinc
  • Steel and ornamental gold are alloys
  • First step in metallurgy is concentration and last step is refining common to all metals.
  • Gaunge is the impurity in the ore







Comments

  1. Xavier Gill27 June 2017 at 01:50

    Wow this blog is a best motivational and Edufirst Learning Centre must use a variety of teaching techniques and media to accommodate the various learning styles.

    ReplyDelete
  2. jmvexothermicwed14 July 2017 at 04:23

    Very informative information to one’s who is new in industry or to those who are frustrated from exothermic welding system & exothermic welding kits . It is a process to get the strong joint for conductors with some suitable simple steps.

    ReplyDelete

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