Endothermic and Exothermic Reactions


The word ‘reaction’ has many meanings, but in chemistry it is when two or more molecules interact and something happens or is produced. There are plenty of reactions in science, but I am going to tell you about two: endothermic and exothermic reactions. Between these two reactions, one produces heat and one consumes it.

An endothermic reaction is one that needs to be supplied with heat. Endothermic reactions are like an opposite of an exothermic reaction. Instead of liberating heat, it absorbs it. One example of this reaction is like cooking an egg. You must bring in heat from the environment to allow your food to cook. Another way the two reactions differ is because the energy content of the reactants is fewer than the products, unlike an exothermic reaction.

An exothermic reaction is one that causes heat. When two substances are mixed or brought together and it generates heat, that is classified as an exothermic reaction. In some exothermic reactions, heat is needed to begin the process, but then it will proceed by itself. In this process, the energy content of the products is more than the reactants. An example of this reaction is a fireplace, it releases heat from its burning logs.



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"Exothermic and Endothermic." MSDS Hyper Glossary . 28 Apr. 2010. Web. 9 Feb. 2011. <http://school.nettrekker.com/goExternal?np=/external.ftl&pp=/error.ftl&evlCode=161339&productName=school&HOMEPAGE=M>.

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