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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