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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.
In order to condense water vapor to water, the molecules must lose energy. Chemistry at About.com states that most exothermic reactions, unlike phase changes, result in higher entropy in the products. An example of an exothermic reaction that is not a phase change is combustion. After wood burns, the result is much less ordered than the reactants that went into the reaction, according to Scientific American.