Test 3: Oxidation-Reduction Reactions
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In acid-base and precipitation reactions, ions ____ but they maintain the ___.
swap partners, same charge.
In oxidation-reduction (redox) reactions, atoms gain or lose electrons by
trading or sharing in different ways
Oxidation number
Number of an element’s gained or lost electrons
To correctly identify and characterize redox reactions we need a way to
track electron ownership and transfer.
How do we track electron ownership and transfer?
by calculating the oxidation number
the first step when assigning an oxidation number is to determine if a species is __(3)
neutral(elemental), an ion or ionic compound, or a covalent compound
The oxidation number for any neutral element in its standard state is
zero
The oxidation number for any ion or ions in an ionic compound
the charge of the ion.
The sum of the oxidation numbers in any molecule or polyatomic ion equals
the total overall charge of that molecule or polyatomic ion.
For covalent compounds, use the following assignments in exactly this order (oxidation-reduction)
H = +1, F = -1, O = -2, (Cl, Br, I )= -1
Oxidation occurs when
something loses electrons
Reduction occurs when
something gains electrons (the charge is reduced)
A polyatomic ion is bound together by a
covalent bond
OiL RiG is a way to remember
Oxidation Loses & Reduction Gains (electrons)