13LIFE Redox introduction -oxidation numbers &electron transfer

What is the oxidation number of Mn in MnO₄^- ?

• +1

• +7

• -7

• +8

The ON of atoms in a molecule eg. MgCl₂...

• Add to 1

• -1

• sum to the charge

• sum to zero

ZnO is a

• molecule

• polyatomic ion

• monoatomic ion

• atom

An increase in ON is...

• Oxidation

• Reduction

Loss of Electrons is...

• Oxidation

• Reduction

When the e^- are on the left hand side of the arrow (the reactant side) the process is

• Oxidation

• Reduction

What is the ON of Zn?

• 4

• -1

• -2

• +1

• 0

-2 is the ON of...

• Hydrogen

• Manganese

• Oxygen

Leo the Lion

• Loss of electrons is oxygen, gain of electrons is reduction

• Gain of electrons is reaction, loss of electrons is oxidation

• Gain of electrons is oxidation, loss of electrons is reduction

• Loss of electron is oxidation, gain of electrons is reduction

How can we tell if a redox reaction has occurred?

• Electron transfer

• Oxidation number change

• If one species has changed