Tuesday, October 20, 2009
Tues-Day 1
Bio 3/6 -we showed how chemical indicators can be used to show evidence of diffusion of various substances such as glucose and starch.
We then did a lab using easily visible plant cells (red onion cells) to see osmosis under hypertonic and hypotonic solution conditions.
AP Chem- we started a marathon gas unit problem covering most of the quantitative aspects of the unit.
Momentarily, I will post the question types that will be on tomorrow's exam.
The test covers
1. Gas stoichiometry with emphasis on applying the gas laws to determine moles and masses of reactants and products. There will be a repeat of the question part involving the determination of all aqueous ion concentrations after a reaction has gone to completion.
2. Descriptive chemistry of the four "gas-forming reactions".
3. Explanation, in terms of (a) molecular collision frequency and (b) molecular collision force/kinetic energy, of any permutation of the ideal gas law.
4. Graham's Law of Effusion in terms of relative rates OR times for different gases.
5. Average (rms) speed of a gaseous molecule of a substance at a given temperature.
6. Dalton's Law questions involving partial pressure, mole fraction, and total pressure.
7. Van der Waal's gas equation and the explanation of the magnitude of the "a" and "b" correction factors of a given substance.
8. the postulates of kinetic-molecular theory relating to the how and why a real gas will behave ideally or will deviate from ideal behavior.
We then did a lab using easily visible plant cells (red onion cells) to see osmosis under hypertonic and hypotonic solution conditions.
AP Chem- we started a marathon gas unit problem covering most of the quantitative aspects of the unit.
Momentarily, I will post the question types that will be on tomorrow's exam.
The test covers
1. Gas stoichiometry with emphasis on applying the gas laws to determine moles and masses of reactants and products. There will be a repeat of the question part involving the determination of all aqueous ion concentrations after a reaction has gone to completion.
2. Descriptive chemistry of the four "gas-forming reactions".
3. Explanation, in terms of (a) molecular collision frequency and (b) molecular collision force/kinetic energy, of any permutation of the ideal gas law.
4. Graham's Law of Effusion in terms of relative rates OR times for different gases.
5. Average (rms) speed of a gaseous molecule of a substance at a given temperature.
6. Dalton's Law questions involving partial pressure, mole fraction, and total pressure.
7. Van der Waal's gas equation and the explanation of the magnitude of the "a" and "b" correction factors of a given substance.
8. the postulates of kinetic-molecular theory relating to the how and why a real gas will behave ideally or will deviate from ideal behavior.
# posted by C @ 5:40 PM 
