Any reaction where electrons are transferred in between reactants is dubbed an reduction-oxidation reaction or redox reaction. These room reactions where one substance wants an electron for this reason badly the it takes it far from one more substance. Whether or not it succeeds counts on that it meets. Because that example, think about the reaction


Ce4+ take it an electron from Fe2+! This is an oxidation/reduction reaction. In this example, Fe2+ is oxidized and Ce4+ is reduced. The charge of Fe walk from +2 come +3, the is, that lost an electron. This procedure is called oxidation.

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Oxidation: The loss of an electron by a substance.

Likewise, the charge of Ce walk from +4 to +3, the is, the gained an electron. This process is dubbed reduction.

Reduction: The acquire of an electron by a substance.

Half-Reactions

Oxidation/reduction reactions are important since we can make use of them as a way of generating electric current. For example, we recognize that Ce4+ will pull an electron far from Fe2+ once we mix the 2 in solution. The trick to making a battery is to uncover a means to make Ce4+ traction an electron indigenous Fe2+ as soon as they room not blended together in a solitary solution.

In order to do this we collection up 2 1/2 reactions in separate beakers and connect them through a salt bridge. The salt bridge electrically associate the two beakers, but avoids Fe2+ and also Ce4+ indigenous mixing.


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You need two 1/2 reactions to do a reaction, so, we add them together.


Fe2+→Fe3++ e-
Ce4+ +e-→Ce3+
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Fe2+ + Ce4+ →Fe3+ + Ce3+

Notice that electrons on both sides of the half-reactions must cancel each various other out when added together.

What about other atoms and also molecules. Exactly how do you recognize if one chemistry substance is strong enough to take an electron native another? We merely refer to a list recognized as the activity series.

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Homework from Chemisty, The main Science, 10th Ed.

4.19, 4.21, 4.23, 4.25, 4.27, 4.39, 4.41, 4.43, 4.45, 4.47, 4.49, 4.51, 4.53, 4.55, 4.57