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Chemical Reaction and Equation - Coggle Diagram
Chemical Reaction and Equation
Characteristic of reaction
Evolution of gas
Change in temp
Formation of percipitate
Change in colour
Change of state
Energy change
Exothermic
heat evolved
Endothermic
heat needed
most decompostion reaction
Types of chemical reaction
Combination/Synthesis Reaction
Decompostion
Thermal - heat
Electrochemical - electrolysis
Photolysic/Photochemical - B&W Photography
Displacement
Reactivity series - K>Na>Ca>Mg>Al>Zn>Fe>Sn>Pl>Cu>Hg>Ag>Au>Ay
Double Displacement
Combustion
heat releasing - exothermic
redox reaction
occur b/w fuel and oxidzing agent
Oxidation and Reduction
Oxidation
loose ELECTRON, HYDROGEN
gain OXYGEN
Reduction
gain HYDROGEN, ELECTRON
loose OXYGEN
Redox agent - both oxidation and reduction occur
Corrosion
Gradual deterioration of materal by action of moisture,air or chemical
Types
Rusting
Corrosion of copper - green
Corrosion of silver - black
Prevention
Painting
iron alloys
galvanization
Corrosion of Taj Mahal
Rancidity
oxidation of fats and oils
gives foul smell and bad taste
cause stomach infection on consumption
Prevention
air tight container
refrigeration
packing with nitrogen
addition of antioxidant or preservatives
Famous antioxidants
butylated hydroxyanisole - BHA
butylated hydroxytoluene - BHT
Propyl gallate - PG
tert butyl hydroquinone - TBHQ