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Every chemical reaction involves a change in energy because different substances hold different amounts of energy. During the reaction, bonds inside the substances that are reacting together must ...

Do not attempt to perform this demonstration. The combustion of methane is an example of an exothermic reaction. More energy is released when the bonds in the products are formed than is used to break the bonds of the reactants. This is shown by larger ...

This is a video about the energy changes involved in chemical reactions, whether exothermic or endothermic. When exothermic reactions transfer energy to the surroundings, the temperature of the ...