Chem CatalystDetermine what is being oxidized and what is being reduced in the following reaction:

CuO + H2 Cu + H2O

Today’s Agenda:1. Do Now2. Notes- Writing half reactions3. HW: Practice Worksheet

Half Reactions:- Show only oxidation or reduction- Include electrons gained or lost to

balance charges

- Losing electrons (oxidation): electrons appear as a product

- Gaining electrons (reduction): electrons appear as a reactant

Half Reactions:- Add electrons to the following half reactions.

Al Al3+

S2- S

Cl Cl-

Sr Sr2+

Voltaic cell- Consists of 2 half-reactions- Cathode: where reduction occurs

(RED CAT)- Anode: where oxidation occurs - Electrons flow from anode to

cathode (electric current)

Voltaic cell

Cu/Zn Redox Reaction- Occurs spontaneously- E- flow from Zn to Cu- This flow of electrons creates an

electrical current- http://www.youtube.com/watch?v=

V7fS1QofMqI

Voltaic Cell Summary:1. Electrons are given off when zinc is

oxidized (anode)2. E- pass through wire to copper3. Copper is reduced (cathode)4. Ions move across salt bridge

http://www.youtube.com/watch?v=nNG5PMlHSoA&feature=related