what are endothermic reaction.
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An endothermic process is any process with an increase in the enthalpy H of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system.
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Reactions that absorb energy or require energy in order to proceed are called endothermic reactions.
For example: When ammonium chloride is dissolved in water in a test tube, the test tube becomes cold. Thus the reaction is an example of endothermic reaction.
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