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Electrons are the negatively charged particles of an atom that are involved in chemical reactions. They are located outside the nucleus of an atom
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Changes in Properties Changes in properties result when new substances form. For instance, gas production, formation of a precipitate, and a color change are all possible evidence that a chemical reaction has taken place. ... Change in Color A color change can signal that a new substance has formed.
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The half-cells separate the oxidation half-reaction from the reduction half-reaction and make it possible for current to flow through an external wire.
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