Chapter 6 Redox Reactions Flashcards
Oxidation Definitions
When a substance gains oxygen
When a substance looses electrons (oxidation state increases)
Reduction Definitions
When a substance looses oxygen
When a substance gains electrons (oxidation state reduces)
What is OIL RIG
Oxidation is loss
Redox is gain
Of Electrons
What does a half equation do
Shows the ions that take part in the reaction
Another name for half equatiosn
Ionic equations
What is the oxidation number
The number of electrons each atom of a substance has lost, gained or shared in forming a compound
Conditions for a redox reaction
Anytime electrons are transferred or the oxidation number is changed, the reaction is a redox reaction
What is the oxidising agent
Oxidises the reducing agent, while being reduced itself
What is the reducing agent
Reduces the oxidising agent, while being oxidized itself
Oxidation number hydrogen
+1
Oxidation number of group 1 sodium
+1
Oxidation number of group 2 calcuium
+2
Oxidation number of group 3 aluminum
+3
Oxidation number of oxygen (except peroxides)
-2
peroxide oxidation state
-1
Group 7 oxidation number
-1
Iron oxidation
+2, +3
Copper oxidation
+1, +2
Manganese oxidation
+2, +4, +7
Chromium oxidation
+3, +4
Potassium magnate formula and colour change and what agent
KMnO4
Purple to colourless
oxidising agent - gets reduced itself
Why is KMnO4 used
Oxidation state of +2, strong urge to reduce the oxidation state
Very strong Oxidising agent
Checks if there is a reducing agent in a solution
What is potassium iodide Formula and colour change
KI
Colourless -> red-brown
Why is 2KI used
Tests the presence of an oxidation agent
reducing agent
when metal nitrates are thermally decomposed what are the products
metal nitrate —-> metal oxide + NO2 + O2
what are exceptions to the metal nitrate decomposition?
group 1 nitrates
metal nitrate —-> metal nitrite + O2
nitrite is (no2)-
when metal carbonates are thermally decomposed what are the products
metal carbonate —–> metal oxide + CO2
which electrode is more reactive
anode
