What processes are endothermic?


Quick Answer

Endothermic, or heat-absorbing, processes include melting ice cubes, evaporating liquid water, melting solid salts, cooking an egg, baking bread, separating ion pairs and splitting a gas molecule. Other examples include forming a cation from an atom in the gas phase and making anhydrous salt from a hydrate.

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Full Answer

Endothermic reactions include: reacting barium hydroxide octahydrate crystals with dry ammonium chloride; reacting ethanoic acid with sodium carbonate; mixing water and ammonium nitrate; mixing water with potassium chloride; reaction of thionyl chloride with cobalt sulfate heptahydrate; and photosynthesis.

An endothermic process is described as a process or reaction that absorbs energy in the form of heat from its surroundings. The name was coined by Marcellin Berthelot, a French chemist noted for the Thomsen-Berthelot principle in thermochemistry. Endothermic is also known as endergonic. If the surroundings do not provide heat, an endothermic transformation results in a decrease in the temperature of the cycle.

For an endothermic process to take place, heat is required, unlike an exothermic process, where heat or light is released. Examples of exothermic processes include making ice cubes, burning sugar, rusting iron, forming ion pairs, thermite reaction, the setting of cement and concrete, and combustion of fuels such as wood and coal.

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