Redox Flashcards
Atoms from what area of the periodic table have multiple oxidation states?
Transition metals
What does AN OX represent?
Oxidation always occurs at the anode
Can oxidation happen by itself?
No, reduction must also occur
What does OILRIG stand for?
Oxidation is loss of electrons, reduction is gain of electrons
Elements in Group 1 and 2 of the periodic table are more likely to - oxidise or reduce?
Oxidise
What does RED CAT represent?
Reduction always occurs at the cathode
For monoatomic ions, how is the oxidation number determined?
The oxidation number is determined by the charge on the ion Eg, Cu2+ has an oxidation number of +2
What do oxidation numbers represent?
They represent the gain or loss of electrons
The sum of the oxidation numbers in a polyatomic ion should equal what?
The charge on the ion
What happens to the oxidation states when the atom undergoes oxidation?
Oxidation states increase
What happens to the oxidation states when the atom undergoes reduction?
Oxidation state decreases
What is a REDOX reaction?
One where both reduction and oxidation occurs simultaneously
What is a corrosion reaction?
Process where metal reacts with chemicals in the atmosphere. The metal must be more stable as an ion than a solid
What is a spectator ion?
An ion that exists in the same state on the reactant and product side of a reaction. Its oxidation state does not change.
What is a half- equation?
An equation that represents either oxidation or reduction
What is oxidation?
Oxidation is the loss of electrons
What is an overall redox equation made up of?
The oxidation and reduction half equations and added together
What is reduction?
Reduction is the gain of electrons
What is an oxidising agent?
A reactant that causes another reactant to lose electrons and be oxidised and is itself reduced
What is the common oxidation number of Group 1 metals ?
Group 1 is + 1 Including - Li+, Na+
What is the common oxidation number of Group 2 metals?
Group 2 is +2 including - Mg2+, Ca2+
When elements lose their valence electrons, do they act as oxidising or reducing agents?
The elements are oxidised and act as reducing agents
What molecule has oxidation number of 0?
Elements including - He, Fe, Li, O2
When is Hydrogen’s oxidation number not equal to +1?
In metal hydrides, hydrogen has a oxidation number of -1 Including - LiH
What occurs to a reducing agent?
Oxidations
When is Oxygen’s oxidation number not equal to -2?
In peroxide (H2O2), oxygen has an oxidation number of -1
What should be the sum of the oxidation numbers in a neutral compound equal?
Zero
Will atoms with high electronegativities tend to oxidise or reduce?
They will undergo reduction
What type of chemical reactions are redox reactions?
Single displacement,
combustion,
electrochemical cells,
corrosion
