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In thermochemical reaction which releases heat,exo-thermic or endo-thermic?
An exothermic reaction is a chemical reaction that releases energy in the form of light or heat. It is the opposite of an endothermic reaction.
Examples:making ice cubes ,formation of snow in clouds   
condensation of rain from water vapor

An endothermic reaction is a reaction that needs energy or heat to occur. When it absorbs the energy there is a temperature drop. Photosynthesis is an endothermic reaction.
Examples: Melting ice cubes,conversion of frost to water vapor,evaporation of water


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