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In the redox reaction 2 KMnO4 + 3 Na2SO3 + H2O → 2 MnO2 + 3 Na2SO4 + 2 KOH, which element is reduced?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
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A molecule becomes oxidized when it __________.
A
loses protons
B
gains neutrons
C
loses electrons
D
gains electrons
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Understand the concept of oxidation in chemistry: Oxidation refers to the loss of electrons by a molecule, atom, or ion.
Recall that oxidation and reduction always occur together in redox reactions; when one species loses electrons (oxidized), another gains electrons (reduced).
Recognize that losing protons (H⁺ ions) or gaining neutrons does not define oxidation; these are different processes unrelated to electron transfer.
Identify that gaining electrons corresponds to reduction, the opposite of oxidation.
Conclude that the correct definition of oxidation is when a molecule loses electrons.
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