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### 7 Cards in this Set

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 oxidation *complete loss of electrons *shift of electrons away from atom in covalent bond *gain of oxygen *loss of hydrogen *increase in oxidation number reduction *complete gain of electrons *shift of electrons toward atom in covalent bond *loss of oxygen *gain of hydrogen *decrease in oxidation number reducing agent (always reactants) substance in a redox reaction that loses electrons oxidizing agent (always reactants) substance in a redox reaction that gains electrons Which atoms are oxidized and which are reduced in this reaction? Zn + 2MnO2 + 2NH4Cl = ZnCl2 + Mn2O3 + 2NH3 + H2O *The element zinc is oxidized b/c it's oxidation number increases 0 to +2. The manganese ion is reduced because its oxidation number decreases +4 to +3. Balance the following equation: Fe2O3 + CO = Fe + CO2 1. Assign oxidation numbers. 2. Identify which atoms are oxidized and which are reduced. -Iron decreases in oxidation number from +3 to 0 (reduction) -Carbon increases in oxidation number from +2 to +4 (oxidation) 3. Make the total increase in oxidation number equal to the total decrease in oxidation number by using appropriate coefficients. -The formula Fe2O3 does not need a coefficient b/c the formula already indicates 2 Fe. What is the oxidation number of: Br- Fe+3 Ca+2 Rule #1: The oxidation number of a monatomic ion is equal to its ionic charge. Br-1: -1 Fe+3: +3 Ca+2: +2