1. Redox Reactions

2.

Reaction involving a transfer of electrons

Short for:reduction-oxidation reaction

3. Reduction and oxidation never occur separately 4. Reduction

Charge of metal is reduced.

Metal cation GAINS electron(s) to become a neutral metal.

5. Ex. Reduction half-reaction 6. Oxidation

Neutral metal LOSES electron(s) to become a metal cation.

7. Ex. Oxidation half-reaction 8. Breathalyzer Test Application of oxidation Alcohol -> Acid + Water

Alcohol in blood is released through capillaries

Air from lungs enters machine and is oxidized

Loss of electrons

Current produced

Machine converts current into numeric reading

Image: http://www.alcohol-breathalyzer-test.com/images/HAN01.1.jpg 9. OILRIG 10. Write the followinghalf-reactions :

reduction of lead (II) ions

oxidation of elemental silver to Ag +

11. For the following reaction:

What is reduced?

What is oxidized?

Write both half-reactions

12. Hint: Re-write withonlythe metals and metal cations.