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First: as a catalyst. Energy is usually required to get a chemical reaction to start. If you imagine it one molecule at a time, there are charged particles involved, and when the configuration is changed there will be a change in energy: either energy released or energy put into the system. So a catalyst, like when you heat a beaker to speed up a reaction, is needed to initiate or speed up a reaction. The heat is thermal energy, which can be needed to bring about chemical change. Second: as a release of energy. Usually, the end-configuration of molecules results in a drop in energy, and energy is released. Usually it is released as heat (thermal energy) or light (radiation, or radiant energy). Think of a bomb, it releases a lot of energy from the chemical reaction very quickly.

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