Chemistry 10 Dr Scholefield Chapter 16 Worksheet Homework is not collected or graded but should be worked on seriously every week Redox Reactions 1 Circle the correct responses Oxidation involves the gain loss of electrons It may also involve the gain loss of oxygen Reduction involves the gain loss of electrons It may also involve the gain loss of oxygen The reactant that is oxidized is also known as the oxidizing reducing agent The reactant that is reduced is also known as the oxidizing reducing agent 2 Determine the oxidation number of the named species sulfur in S2O32 Mn in KMnO4 Phosphorus in PCl3 Cr in Cr2O7 2 oxygen in OF2 nitrogen in NH4 1 hydrogen in MgH2 carbon in H2CO3 3 Use oxidation numbers to determine whether each of the following changes is an oxidation or a reduction SO2 to SO3 MnO2 to Mn2O3 H to H2 ClO3 1 to ClO 1 Pb2 to Pb4 CrO4 2 to CrO3 N2O to NH3 HI to I2 1 Circle the correct responses When an atom is oxidized its oxidation number increases decreases When an atom is reduced its oxidation number increases decreases 4 For the following reactions assign oxidation numbers to each atom ion Then identify I which species is oxidized and which is reduced and II the oxidizing agent and the reducing agent a 6 K s N2 g b Cl2 g 2 Br 1 aq c CuO s CO g Cu s CO2 g d C2H4 g e 8 H 1 aq Cr2O7 2 aq 3 C2H6O l f SO4 2 aq 2 CH2O aq 2 H 1 aq F2 g 2 K3N s Br2 l 2 Cl 1 aq C2H4F2 g 2 Cr 3 aq H2S aq 3 C2H4O l 2 CO2 g 7 H2O l 2 H2O l Balancing Redox Reactions via the Half Reaction Method 5 Use the half reaction method to balance the following redox reactions in acidic solutions a NO3 1 aq Ag s MnO4 1 aq b H2C2O4 aq c Cr 3 aq BiO3 1 aq NO2 g Ag 1 aq CO2 g Mn 2 aq Cr2O7 2 aq Bi 3 aq
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