Recall the mnemonic for redox reactions:
Loss Electrons → Oxidation → Reducing Agent
Gain Electrons → Reduction → Oxidizing Agent
This means the element that gains electrons/reduced is the oxidizing agent while the element that loses electrons/oxidized is the reducing agent.
Identify the oxidizing agent and the reducing agent for each reaction:
a. Al(s) + 3 Ag+(aq) → Al3+(aq) + 3 Ag(s)
b. SO3(g) + H2O(l) → H2SO4(aq)
c. Ba(s) + Cl2(g) → BaCl2(s)
d. Mg(s) + Br2(l) → MgBr2(s)
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What scientific concept do you need to know in order to solve this problem?
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