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Chemistry Exothermic and endothermic reactions Heat is given out in an exothermic reaction. We know this because the surroundings get warm. In an endothermic reaction, energy is taken in from the surroundings. The surroundings then have less energy than they started with, so the temperature falls. An equation can be used to show that some of the bonds in the reactants break during the chemical reaction. New combinations of bonds are made as the products form. Making and breaking of bonds involves energy. You need to supply energy (heat) to break bonds, so bond breaking is endothermic. When new bonds are made energy (heat) is released to the surroundings, so bond making is exothermic Energy level diagrams We can show these energy changes on an energy level diagram. * The atoms and molecules here have been drawn on levels so that the atoms at the top have more energy than the molecules at the bottom. * Look at...

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