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Unit4 - Coggle Diagram
Unit4
Chemical reactions
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Redox
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Oxidation number
Rules (Always write the sign in front)
oxidation number for an element in elemental state is 0
oxidation number for any monoatomic ion is the charge on it
The sum of oxidation numbers of individual atoms in a compound is 0
The sum of oxidation numbers on a compound ion is the charge on it
The oxidation number for O is -2 except for H2O2 which makes it -1
The oxidation number for H is +1 unless bonded with groups 1 or 2
The oxidation of F is always -1
(In a compound)
Oxidation number for groups 1 and 2 in a compound is always their group number
Interpretation
If oxidation number increased, oxidized
If oxidation number decreases, reduced
Balanced equations
Assign oxidation numbers
Split into half equations by looking at oxidation
Balance all elements except H and O
Balance H and O using H2O and H+
Balance charges by adding e-
Multiply half reactions to give same number of e-
Add half reactions (left side and right side) and cancel whats same on both sides
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Identification (fast)
Redox, may contain oxygen
Acid Base: Shifting of H+
Precipitation: solid product from aqueous reactants
Background
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Stoichiometry
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Gas stoichiometry
Molar volume
s.t.p. 22.4 L/mol
r.t.p. 24 L/mol
Note: not to be confused with molarity, molar volume means how much space one mole of a substance takes up, whereas molarity means how much is in 1 liter
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