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5122271
4.3 Redox
Description
AS - Level Chemistry (4 - Acids and Redox) Mind Map on 4.3 Redox, created by Bee Brittain on 13/04/2016.
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redox
chemistry
acids
bases
oxidation
reduction
science
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mind map
redox reactions
chemistry
4 - acids and redox
as - level
Mind Map by
Bee Brittain
, updated more than 1 year ago
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Bee Brittain
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Resource summary
4.3 Redox
Oxidation Number
Can be thought of as the number of electrons involved in bonding to a different element
Helps when writing formulae and balancing equations as a check that all electrons are counted for
Oxidation Number RULES
Always zero for elements
Each atom in a compound has an oxidation number
An oxidation number has a sign which is placed before the number
Oxidation Numbers
Element
Oxidation Number
-2
O
CaO
+1
H2S
H
-1
HF
F
+2
MgCl2, CaO
Mg 2+, Ca2+
-1
HCl, KBr, CaI2
Cl- , Br- , I-
Example
Special Cases
Oxidation Numebr
-1
NaH, CaH2
H in metal hydrides
-1
H2O2
O in peroxides
+2
F2O
O bonded to F
Element
Example
Using Roman numerals in naming
The roman numeral shows the oxidation state (number) of the element, without a sign
E.g/ Iron(II) represents Fe2+ with oxidation number +2
E.g/ Iron (III) represents Fe3+ with oxidation number +3
Redox Reactions
Reduction and Oxidation
O.I.L R.I.G
Oxidation Is Loss (of electrons) Reduction Is Gain (of electrons)
Redox reactions involve reduction AND oxidation
If something is reduced, something else must be oxidised
Reduction is a decrease in oxidation number
Oxidation is an increase in oxidation number
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