Write the oxidation numbers for each of the following: Bellwork Wednesday Write the oxidation numbers for each of the following: 1. K2CrO4 2. LiMnO4 3. H2SO4 4. SO3 5. Na2SnO2 6. KClO3

Oxidation is an increase in oxidation number. Reduction is a decrease in oxidation number. Oxidizing agent- The substance in a redox reaction that accepts electrons the substance that was reduced *The entire reactant is called the oxidizing agent* Reducing agent- The substance in a redox reaction that donates electrons the substance that was oxidized *The entire reactant is called the reducing agent*

19.3 REDOX Reaction Examples Identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent for each of the following: MnO2 + 4HCl  MnCl2 + Cl2 + 2H2O +4 -2 +1 -1 +2 -1 +1 -2 Mn +4 +2 Gained 2 e- Reduced “Oxidizing Agent” (MnO2) Cl -1 Lost 1 e- Oxidized “Reducing Agent” (HCl)

“Oxidizing Agent” (HNO3) Identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent for each of the following: Cu + HNO3  Cu(NO3)2 + NO2 + H2O +1 +5 -2 +2 +5 -2 +4 -2 +1 -2 Cu +2 Lost 2 e- Oxidized “Reducing Agent” (Cu) N +5 +4 Gained 1 e- Reduced “Oxidizing Agent” (HNO3)

Let’s Practice! Write the oxidation numbers of the elements and then indicate which substance was oxidized, which was reduced and which are the oxidizing a reducing agents. 2Mg + O2  2MgO AgNO3 + Cu  CuNO3 + Ag Oxidized: Oxidized: Reduced: Reduced: Ox. Agent: Ox. Agent: Red. Agent: Red. Agent: Mg Cu O Ag O2 AgNO3 Mg Cu

Let’s Practice! Write the oxidation numbers of the elements and then indicate which substance was oxidized, which was reduced and which are the oxidizing a reducing agents. CH4 + O2  CO + 2H2O 2Fe2O3 + 3C  4Fe + CO2 Oxidized: Oxidized: Reduced: Reduced: Ox. Agent: Ox. Agent: Red. Agent: Red. Agent: C C O Fe O2 Fe2O3 CH4 C