Electrochemistry deals with chemical reactions that generate electricity and the changes associated with the passage through matter of electrical current. The reactions require moving electrons, and hence are oxidation (or redox) reactions. Most metals may be purified by electrochemical methods or electroplated. Power batteries are used for devices such as cars, smartphones, electronic tablets, watches, pacemakers and many more. Batteries use chemical reactions that naturally create energy, which can be transformed into useful work.
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