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Unformatted text preview: ) (c) Phosphorescence ( 3 pts ) (d) Fluorescence ( 3 pts ) 3. In formaldehyde, the transition n * (T 1 ) occurs at 397 nm while the transition n * (S 1 ) occurs at 355 nm. (i) What is the difference in energy (kJ/mol) between the S 1 and the T 1 state? ( 3 pts ) (ii) What is the difference in energy in (i) above attributed to? ( 2 pts ) 4. You are provided with the standard reduction potentials below: Fe 2+ (aq) + 2e-Fe(s) E = -0.440 V Al 3+ (aq) + 3e-Al(s) E = -1.677 V (a). Write down both the cathodic and the anodic half-cell reactions for a functional electrochemical cell formed between the two electrodes. ( 2 pts ) Cathode: Anode: Hence write the balanced overall reaction for the cell. ( 3 pts )...
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- Fall '10