Practice: Which element is being reduced in the following reaction?
Cr2O72- + 3 HNO2 + 5 H+ → 2 Cr3+ + 3NO3- + 4 H2O
Redox Reactions (oxidation-reduction reactions) involve transference of an electron(s) between reactants.
Oxidation-Reduction Reactions
Concept #1: Redox Reactions
To remember the difference between oxidation and reduction just learn: LEO the lion goes GER
Concept #2: Redox Reactions
Oxidizing Agent is reduced and in turn oxidizes another element/compound.
Reducing Agent is oxidized and in turn reduces another element/compound.
Example #1: Which reactant is undergoing oxidation and which reactant is undergoing reduction?
Practice: Identify the oxidizing agent and reducing agent from the following redox reaction.
Ba (s) + Cl2 (g) → BaCl2 (aq)
Practice: Which element is oxidized and which is reduced in the following reaction?
Hg (aq) + HgCl2 (aq) → Hg2Cl2
Practice: Which of the following represents an oxidation-reduction reaction?
I. PCl3 (aq) + Cl2 (g) → PCl5 (aq)
II. 2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s)
III. CO2 (g) + 2 LiOH (aq) → Li2CO3 (aq) + H2O (l)
IV. FeCl2 (aq) + 2 NaOH (aq) → Fe(OH)2 (aq) + 2 NaCl (aq)