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Warm-up April 19 th , 2010

Warm-up April 19 th , 2010. Which diagram represents a situation where a reaction should take place? Why?. Cr. Cu. Cu 2+. Cr 3+. A Redox Reaction 2 Cr + 3 Cu 2+  2 Cr 3+ + 3 Cu. Cr. Two “half-reactions” 2 Cr  2 Cr 3+ + 6 e - (oxidation)

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Warm-up April 19 th , 2010

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  1. Warm-upApril 19th, 2010 • Which diagram represents a situation where a reaction should take place? Why? Cr Cu Cu2+ Cr3+

  2. A Redox Reaction2 Cr + 3 Cu2+ 2 Cr3+ + 3 Cu Cr Two “half-reactions” 2 Cr  2 Cr3+ + 6 e- (oxidation) 3 Cu 2+ + 6 e-  3 Cu (reduction) Which one is oxidation and which one is reduction? Cu2+ e-

  3. e- e- e- Anode Cathode 1.55 V Cr Cu Cr3+ Cu2+ Salt Bridge Which way are the electrons flowing? Anode – the electrode where the electrons are flowing in Cathode – the electrode where the electrons are flowing out

  4. e- e- e- Anode Cathode 1.55 V Cr Cu Cr3+ Cu2+ Salt Bridge

  5. e- e- e- Anode Cathode Voltage 1.55 V • Voltage: A measure of the electrical potential difference between two points • Current: Amount of charge transferred per unit time Cr Cu Cr3+ Cu2+ Salt Bridge

  6. Your Task • Build a cell that will produce the greatest current possible given the materials. • Build at least three batteries • What you will hand in: • A diagram • How much current you were able to produce

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