4.3 Redox

Bee Brittain
Mind Map by Bee Brittain, updated more than 1 year ago
Bee Brittain
Created by Bee Brittain almost 4 years ago


AS - Level Chemistry (4 - Acids and Redox) Mind Map on 4.3 Redox, created by Bee Brittain on 04/13/2016.

Resource summary

4.3 Redox
1 Oxidation Number
1.1 Can be thought of as the number of electrons involved in bonding to a different element
1.1.1 Helps when writing formulae and balancing equations as a check that all electrons are counted for
2 Oxidation Number RULES
2.1 Always zero for elements
2.2 Each atom in a compound has an oxidation number
2.3 An oxidation number has a sign which is placed before the number
3 Oxidation Numbers
3.1 Element
3.2 Oxidation Number
3.2.1 -2 O CaO +1 H2S H -1 HF F +2 MgCl2, CaO Mg 2+, Ca2+ -1 HCl, KBr, CaI2 Cl- , Br- , I-
3.3 Example
3.4 Special Cases
3.4.1 Oxidation Numebr -1 NaH, CaH2 H in metal hydrides -1 H2O2 O in peroxides +2 F2O O bonded to F
3.4.2 Element
3.4.3 Example
4 Using Roman numerals in naming
4.1 The roman numeral shows the oxidation state (number) of the element, without a sign
4.1.1 E.g/ Iron(II) represents Fe2+ with oxidation number +2 E.g/ Iron (III) represents Fe3+ with oxidation number +3
5 Redox Reactions
5.1 Reduction and Oxidation
5.1.1 O.I.L R.I.G Oxidation Is Loss (of electrons) Reduction Is Gain (of electrons)
5.1.2 Redox reactions involve reduction AND oxidation If something is reduced, something else must be oxidised
5.2 Reduction is a decrease in oxidation number
5.3 Oxidation is an increase in oxidation number
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