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An endothermic reaction occurs when the energy used to break the bonds in the reactants is greater than the energy given out when bonds are formed in the products. This means that overall the reaction takes in energy, therefore there is a temperature decrease in the surroundings. Electrolysis is an example of an endothermic reaction but you can create one easily in the kitchen just by dissolving salt or sugar in water.
Aug 26, 2015. Because they require energy. An endothermic process is one that needs to have energy added in order to take place. A simple example of an endothermic process is the melting of ice, because ice doesn't melt unless you put energy into it. This is also the case with other phase changes. If we want to boil water, we need to heat it up by pumping energy into it, and then once it boils we need to continue pumping energy into it until it has all turned to steam. However... Not all phase changes are endothermic.