SME
Grade 10 Science · Problem type
Oxidized, reduced or neither?
Use this for “In Zn + Cu²⁺ → Zn²⁺ + Cu, which substance is oxidized?”
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Is the substance oxidized, reduced or neither?
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Assumptions
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Oxidation is losing electrons; reduction is gaining them (OIL RIG).
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Compare each atom’s charge or oxidation number before and after the arrow.
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An ion that ends as it started is a spectator: neither.
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Related lessons
Oxidation-reduction reactions, electrochemistry, electrolysis and corrosion
Main lesson
Standard cell voltage
Use this for “What voltage does a zinc–copper cell give?”: E°cell from the two metals’ reduction potentials.
Oxidation numbers: the atom to find
Use this for “What is the oxidation number of S in H₂SO₄?” or in SO₄²⁻.
Galvanic or electrolytic cell?
Use this for “How is an electrolytic cell different from a battery?”