Oxidation States 😐 Flashcards
Oxidation is …
Gain of oxygen
Loss of hydrogen
Loss of electrons
Increase in oxidation number
Reduction is …
Loss (removal) of oxygen
Gain of hydrogen
Gain of electrons
Decrease in oxidation state
What is a Redox reaction
A reaction that involves the transfer of electrons
What is oxidation state rule 1
Uncombined elements have an oxidation state of o
State oxidation state rule 2
The sum of all the oxidation states in a compound is o as all compounds are electrically neutral.
Oxidation state rule 3
The sum of the oxidation states of a complex ion, equals the charge of the ion
Oxidation state rule 4
In a compound, the most electronegative element always has a negative oxidation state
Oxidation state rule 5
Roman numerals could be used represent the oxidation state of an element in a compound. For example, Copper (Il) chloride, CuCla, shows that copper has an oxidation state of +2.
Oxidation state rule 6
Some elements always have the same oxidation state in all their compounds, Other usually have
the same oxidation states.
Oxidation number rule Uncombined element
(Element not in a compound)
Oxidation number would be 0
Oxidation number rule in In monoatomic ions
Oxidation number is Same as the charge on the monoatomic lon
Oxidation number rule for Group 1 element in a compound
Always +1
Oxidation number rule for Group 2 element in a compound
Always +2
Hydrogen in a compound
Oxidation number rule +1 when bonded to non-metals
-1 when bonded to a metal
-2 except in peroxides (-1) e.g.
