Topic 9 - Redox

Oxidation State

Charge & number assigned to atoms and ions

Oxidation state of elements

0

Oxidation state for monoatomic

Same as their charge

Oxidation state for oxygen with an element

-2

Exception for the oxidation state of oxygen

H₂O₂ = -1

Oxidation state for hydrogen

+1

Exception to the oxidation state of metal hydrides

-1

Sum of oxidation states of polyatomic compounds

0

Oxidation state of polyatomic ion

Equal to charge of ion

OIL

Oxidation is loss

RIG

Reduction is gain

Oxidation process (increase or decrease in oxidation number)

Increase

Reduction process (increase or decrease in oxidation number)

Decrease

Balance the reactions below that occur in an acidic solution. Write the two half-equations and the full equation.

yes

Balance the reactions below that occur in an acidic solution. Write the two half-equations and the full equation.

yes

Balance the reactions below that occur in an acidic solution. Write the two half-equations and the full equation.

yes

When added, does a more reactive metal displace a less reactive metal in a solution?

yes

When added, does a less reactive metal displace a more reactive metal in a solution?

no

Displacement

Replacing a spot

More reactive (e^- wanting to be __)

given away

Less reactive (e^- wanting to be __)

kept