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An exothermic reaction is a chemical reaction in which energy is released as heat. In other words, the products of the reaction have lower energy than the reactants, resulting in the release of heat.
One example of an exothermic reaction is the combustion of gasoline in an automobile engine. When gasoline reacts with oxygen in the presence of a spark, it undergoes a combustion reaction, releasing energy in the form of heat. This heat energy is used to power the engine and move the vehicle forward. During the reaction, the carbon and hydrogen atoms in the gasoline combine with the oxygen atoms in the air to produce carbon dioxide and water vapor. This reaction releases a significant amount of energy, which is why gasoline is used as a fuel source in many vehicles.
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The chemical reaction in which the heat is absorbed is known as an Endothermic reaction. Examples are melting ice cubes and melting solid salts.
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