Activity 1: FIND THE CORRECT NUMBER Directions: Assign the correct oxidation number of the individual atom in the compound or ion below. 1. Sin Sa 6. Sin SO42- 2. Cl in CaCl2 3. lin 1O3 4. Cin HCO3 5. Sin Fez(SO4)3 7. Sin NazSO4 8. As in KaAs04 9. Crin Cr2O72 10.N in NH4* Activity 2: EXAMINE ME Directions: Examine the given chemical reactions and answer the given questions in each item. 1. Label the following as oxidation or reduction. a. Conversion of Br to Brz b. Conversion of Fe2 to Fe3+ c. Change in oxidation number in a negative direction. 2. In the balanced equation: 12+ 5C12 + 6H2O 2HIO3 + 10HCI a. What element was reduced? b. What element was oxidized? c. What substance is the oxidizing agent? d. What substance is the reducing agent? 3. The equation below shows the corrosion of Iron when exposed to 4Fe+ 302 2Fe203 a. What element was reduced? b. What element was oxidized? c. What substance is the oxidizing agent? d. What substance is the reducing agent? 4. Burning of methane is common among households that uses gas stove. The reaction below shows the combustion of methane: yen: CH4+202 CO2 +2H20 a. What element was reduced? b. What element was oxidized? c. What substance is the oxidizing agent? d. What substance is the reducing agent?