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SMC CHEM 10 - Chapter 16 Worksheet

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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+1 to H2 ClO3-1 to ClO-1 Pb2+ to Pb4+ CrO4-2 to CrO3 N2O to NH3 HI to I2 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) → 2 K3N (s) b. Cl2 (g) + 2 Br-1 (aq) → Br2 (l) + 2 Cl-1 (aq) c. CuO (s) + CO (g) → Cu (s) + CO2 (g) d. C2H4 (g) + F2 (g) → C2H4F2 (g) e. 8 H+1 (aq) + Cr2O7-2 (aq) + 3 C2H6O (l) → 2 Cr+3 (aq) + 3 C2H4O (l) + 7 H2O (l) f. SO4-2 (aq) + 2 CH2O (aq) + 2 H+1 (aq) → H2S (aq) + 2 CO2 (g) + 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) → NO2 (g) + Ag+1 (aq) b. H2C2O4 (aq) + MnO4-1 (aq) → CO2 (g) + Mn+2 (aq) c. Cr+3 (aq) + BiO3-1 (aq) → Cr2O7-2 (aq) + Bi+3


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SMC CHEM 10 - Chapter 16 Worksheet

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