9. summary Reaction mixture feels cold Reaction mixture feels warm Temperature of surroundings drops Temperature of surroundings increases Net absorption of heat energy from surroundings Net release of heat energy to surroundings More energy absorbed than energy evolved More energy evolved than energy absorbed Strength of bonds broken stronger than strength of bonds formed Strength of bonds formed greater than strength of bonds broken Endothermic Reaction Exothermic Reaction
10. Examples of exothermic and endothermic reactions: Thermal decomposition Dissolving some ionic salts in water, like ammonium chloride, potassium nitrate and copper(II) sulphate etc… Photosynthesis Action of light on silver bromide Combustion Respiration Neutralisation Dissolving acids Dissolving alkalis Rusting Oxidation of metals Nuclear Endothermic reactions Exothermic reactions
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13. Exothermic reaction Energy Time Reactants Products Activation energy H : -ve
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