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Unformatted text preview: prevents Fe 2+ and Ce 4+ from mixing. You need two 1/2 reactions to make a reaction, so, we add them together. Fe 2+ → Fe 3+ + e-Ce 4+ + e-→ Ce 3+ __________________________________ Fe 2+ + Ce 4+ → Fe 3+ + Ce 3+ Notice that electrons on both sides of the half-reactions must cancel each other out when added together. What about other atoms and molecules. How do you know if one chemical substance is strong enough to take an electron from another? We simply refer to a list known as the activity series ....
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