Review Quiz 2

1) Gibbs Free Energy 76G = ~nFE #65, 71

Faraday = 96485 C

n = # moles of electrons transferred in the process

2) Solving for Keq: At Equilibrium, for a galvanic cell there is no workproduced.

a. E = 0

b. Q= K

c. Practice solving a problem to get the math right!

3) Electrolysis # 77, 81, example p 817

How much chemical change occurs wi the flow of a given current? For aspecified time?

Plating means depositing the neutral metal on the electrode by reducingthe metal ions in solution.

Reduction process happens at the cathode.".

Current = [amp] A = 1 coulomb of charge per second

Time = in seconds

How much? = in grams or in moles (depending on the question)

Current & QuantityMoles of Moles Grams

Time of charge 4-electrons -+ of metal

--+-of

inmetal

Coulombs

1. Coulombs of charge = amps x seconds = Cis x s.

2. 1 mole of electrons carries a charge of 1 faraday or 96485C.

a. (Can calculate # moles that can carry an amount ofcoulombs of charge)

3. Determine # of electrons involved in transfer.

4. Convert moles of metal to grams of metal (g).

Sunlight emits all wavelengths of light in the visible region.

Sunlight provides a Continuous spectrum.

The hydrogen emission spectrum is called a Line spectrum. This means only certain energies areallowed for the electron in the hydrogen atom.

Changes in energy between certain energy levels will emit specific wavelengths.

hrnV

•••~h "..=?tV

de.~"~ Ect~