Oxidation Numbers – Practice with the Rules

ChemistryReactions & RedoxAges 15–16

Choose a compound or ion (KMnO₄, H₂SO₄, NH₄⁺, Fe₃O₄, K₂Cr₂O₇, H₂O₂, NaH, SO₄²⁻…), enter the oxidation number of each element and check: the simulation checks each value and verifies that the oxidation numbers add up to the charge. The step-by-step button applies the rules one at a time; a second tab gives sample reactions for identifying the oxidizing agent and the reducing agent and drawing the electron-transfer diagram.