Galvanic Cells

Galvanic Cells

Review Year 11

Quick review

• What is a galvanic cell

• Using the standard reduction potentials table to calculate the voltage of the cell

• determining spontaneity of a redox reaction

Galvanic cells

- Produces electrical energy through circuit

- Separates the redox reaction

- Measures voltage --> the difference in reactivity between the 2 electrodes

- References the metal reactivity series and standard reduction potentials data

Multiple Choice

The galvanic cell shown below was set up in an experiment:

Zn(s) | Zn²⁺ \\ Cu²⁺ | Cu(s)

Which correctly shows the oxidation half equation for the galvanic cell?

• Zn(s) + 2e^- --> Zn²⁺

• Zn(s) --> Zn²⁺ + 2e^-

• Cu(s) + 2e^- --> Cu²⁺

• Cu(s) --> Cu²⁺ + 2e^-

Calculating voltage of a cell

• Must use the reaction given and the standard reduction potentials data (from data sheet)

• Steps:

• 1. Find the two half reactions on the table (reverse oxidation)

• 2. Add together

Multiple Choice

Using the same galvanic cell as before:

Zn(s) | Zn²⁺ \\ Cu²⁺ | Cu(s)

Determine the voltage of the galvanic cell.

• 1.28

• -0.42

• -0.24

• 1.1

Fill in the Blanks

When calculating the standard voltage of a redox reaction, the reaction is spontaneous when it is _?

If you're still unsure about this content:

• Make sure you've worked through the entire Edrolo section

• Attempt all worksheet questions, and reattempt any questions you get wrong

• Chapter review questions in textbook (page 295)

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