Electrochemistry A lemon can power a small light bulb. Where does the energy come from? RedOx reactions move electrons from one element to another.

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Presentation transcript:

Electrochemistry

A lemon can power a small light bulb. Where does the energy come from? RedOx reactions move electrons from one element to another. Moving electrons is electricity.

Electrochemistry Zn(s) + Cu 2+ (aq) → Zn 2+ (aq) + Cu(s)

2e - Zn(s) + Cu 2+ (aq) → Zn 2+ (aq) + Cu(s) Zn → Zn e - Cu e - → + Cu Electrochemistry

Can we separate these half-reactions? Zn(s) + Cu 2+ (aq) → Zn 2+ (aq) + Cu(s) Zn → Zn e - Cu e - → + Cu

Zn → Zn e - Cu e - → Cu Electrochemistry

Zn → Zn e - Cu e - → Cu Electrochemistry

Zn → Zn e - Cu e - → Cu 1 st problem: No way to pass electrons from zinc to copper. Electrochemistry

Zn → Zn e - Cu e - → Cu 1 st problem: No way to pass electrons from zinc to copper. Solution: Add a wire. Electrochemistry

Zn → Zn e - Cu e - → Cu 1 st problem: No way to pass electrons from zinc to copper. Solution: Add a wire. Electrochemistry

Zn → Zn e - Cu e - → Cu 2 nd problem: Buildup of plus and minus charges. Electrochemistry

Zn → Zn e - Cu e - → Cu 2 nd problem: Buildup of plus and minus charges. Solution: A salt bridge. Electrochemistry

Zn → Zn e - Cu e - → Cu 2 nd problem: Buildup of plus and minus charges. Solution: A salt bridge. Electrochemistry

Zn → Zn e - Cu e - → Cu 2 nd problem: Buildup of plus and minus charges. Solution: A salt bridge. Electrochemistry

Zn → Zn e - Cu e - → Cu 2 nd problem: Buildup of plus and minus charges. Solution: A salt bridge. Electrochemistry

oxidation reduction A salt bridge is made of salt dissolved in gel. Ions can cross the bridge, but the solutions in the two beakers cannot. Electrochemistry

oxidation reduction This is a kind of electrochemical cell called a voltaic cell. Electrochemistry