Respiration is an exothermic process in organisms.
Known as catabolic reactions in organisms, it breaks down molecules into smaller units and releases energy.
In the process of respiration,an intake of oxygen and release of carbon dioxide takes place. The food molecules break down into simpler substances like glucose, which combines with oxygen and provides energy to our body. This process is an exothermic reaction since it involves release of energy.
Examples of exothermic reactions includes the combustion of fuels, the reaction of acids and bases, nuclear fusion in hydrogen bombs, nuclear fission, etc.
In an endothermic reaction, energy is taken from the surroundings.
Photosynthesis is an example of endothermic reactions where plants absorb the sunlight to convert carbon dioxide and water into oxygen and sugar.
Melting ice, evaporation, and cooking are also examples of endothermic reactions.
Enthalpy is positive for endothermic reactions, and enthalpy is negative for exothermic reactions.
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