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Unformatted text preview: Carbonic acid is unstable and forms CO2 & H2O
H2CO3(aq) → CO2 + water
(The antacid tablet contains citric acid + NaHCO3) Oxidation-Reduction Reactions
REDOX = reduction & oxidation
O2(g) + 2 H2(g) → 2 H2O(l) Oxidation-Reduction Reactions
• Oxidation involves a reactant atom or compound losing
• Reduction involves a reactant atom or substance gaining
• Neither process can occur alone… that is, there must be
an exchange of electrons in the process.
• The substance that is oxidized is the reducing agent
• The substance that is reduced is the oxidizing agent
oxidized reduced Mg(s) + 2H+(aq) →
agent Mg2+(aq) + H2(g) Oxidation Numbers
• Chemists use oxidation numbers to account for the
transfer of electrons in a RedOx reaction.
• Oxidation numbers are the actual or apparent
charge on the atom when alone or combined in a
1. The atoms of pure elements always have an
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