Friday, April 20, 2007
Fri-Day 4
Honors: we carefully walked through all of the Le Chatelier and kinetic possibilities for chemical and solution/phase equilibrium problems.
In G period, we defined the equilibrium constant expression, Keq, and discussed its meaning.
Reg: we did a few more practice Le Chatelier problems and then went on to the definition and meaning of the equilibrium constant, Keq, emphasizing that solids and liquids are NOT included in the expression because their concentrations do not change.
AP: we continued to do electrolytic cells. We discussed electroplating and then we explained how to determine the anode and cathode reactions for a given electrolysis and also the minimum battery voltage required to drive such a reaction. We discussed the electrolysis of molten NaCl, aqueous NaCl ("brine"), and water.
As a point of interest only, we looked at the kinetic vs. thermodynamic competition that occurs when aqueous NaCl is electrolyzed.
We then did a quantitative electrolysis calculation. We determined the number of moles of Cu plated via electrolysis given a certain electric current, a time, and a way to calculate the moles of electrons per mol of reaction. We'll do another of those on Monday and then fuel cells will close out our ultimate unit.
Do A LOT of the electrochem problems this weekend!
In G period, we defined the equilibrium constant expression, Keq, and discussed its meaning.
Reg: we did a few more practice Le Chatelier problems and then went on to the definition and meaning of the equilibrium constant, Keq, emphasizing that solids and liquids are NOT included in the expression because their concentrations do not change.
AP: we continued to do electrolytic cells. We discussed electroplating and then we explained how to determine the anode and cathode reactions for a given electrolysis and also the minimum battery voltage required to drive such a reaction. We discussed the electrolysis of molten NaCl, aqueous NaCl ("brine"), and water.
As a point of interest only, we looked at the kinetic vs. thermodynamic competition that occurs when aqueous NaCl is electrolyzed.
We then did a quantitative electrolysis calculation. We determined the number of moles of Cu plated via electrolysis given a certain electric current, a time, and a way to calculate the moles of electrons per mol of reaction. We'll do another of those on Monday and then fuel cells will close out our ultimate unit.
Do A LOT of the electrochem problems this weekend!
# posted by C @ 1:02 PM 
