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Respiration is a pure exothermic reaction because when we exhale there us carbon dioxide along with the residual oxygen and with certain amount of water vapour. No heat energy is provided during inhalation however the energy or heat liberated during oxidation of the food and other activities comes out as heat energy. Since there is heat energy released during respiration the reaction is called to be the exothermic reaction.
1 An exothermic reaction feels cold. 2  In an exothermic reaction, the energy stored in the products is less than that stored in the reactants. 3  The heat of reaction for an exothermic reaction is a negative number. 4  Gases possess a great deal of translational motion.  Molecules of solids are free to rotate.