Monday, November 10, 2008
Mon-Day 1
AP Chem- Chapter 5 Gas Unit HW is due on Wednesday. I will post a video if many of you are having trouble with a particular problem, though I do not expect that since we did each problem type in the notes. NOTE: for question 85, you must use Table 5.3 on page 224 of the text to get the Van der Waal's correction factors for Nitrogen gas.
We collected the data for our Boyle's Law lab. The purpose so far is just to familiarize each of you with the Pasco interfaces and software. I will give you the writeup instructions on that AFTER we finish the redox titration lab writeup (one lab at a time, overall).
We then finished our stoichiometry/Dalton's Law problem involving the collection of a gas over water. The BIG hint in these problems is that the VAPOR PRESSURE of water at the experiment's TEMPERATURE will be given in the data! You MUST subtract that water vapor pressure from the TOTAL gas pressure to get the partial pressure of the "other" gas that is in the collection tube.
The point of most of these problems is to get the PARTIAL pressure of a given gas, convert it to moles of THAT PARTICULAR substance, use that number of moles in the BALANCED chemical equation in order to get the moles/grams/liters/particles of some other reactant or product in the reaction.
We then discussed the 4 postulates/assumptions required to derive (on paper, even!) the ideal gas law.
Any gas that eschews/deviates from those four postulates due to, say, low temperature and/or high pressure, will no longer obey the ideal gas equation.
Van der Waal's, in order to make the ideal gas equation "work" for real gases, developed EMPIRICALLY/VIA EXPERIMENT some "correction factors", "a" and "b", to account for the actual intermolecular attractions ("a") that exist between all gas molecules and to account for the actual particle volumes ("b") that each gas molecule has.
Bio 6/7- we reviewed transcription and translation, looking at several more detailed diagrams of the processes.
We finished our plant and animal cell mitosis lab discussion and then we began a lab simulation in which you "became"/acted out the mRNA and tRNA molecules involved in transcription and translation. You transcribed the DNA code in the nucleus/"front of the room" into an mRNA molecule which then via facilitative diffusion/"went to the ribosomes at the back of the room" where particular tRNA anticodons were attracted to the mRNA codons of your mRNA molecule. You wrote down the sequence of amino acids that were brought along by the tRNA molecules. For fun, to see what "behavior" the protein caused, we associated the amino acid sequence with a particular sequence of words/ a sentence that caused a particular behavior.
Bio 8- we reviewed transcription and translation, looking at several more detailed diagrams of the processes. We also finished our plant and animal cell mitosis lab discussion.
We collected the data for our Boyle's Law lab. The purpose so far is just to familiarize each of you with the Pasco interfaces and software. I will give you the writeup instructions on that AFTER we finish the redox titration lab writeup (one lab at a time, overall).
We then finished our stoichiometry/Dalton's Law problem involving the collection of a gas over water. The BIG hint in these problems is that the VAPOR PRESSURE of water at the experiment's TEMPERATURE will be given in the data! You MUST subtract that water vapor pressure from the TOTAL gas pressure to get the partial pressure of the "other" gas that is in the collection tube.
The point of most of these problems is to get the PARTIAL pressure of a given gas, convert it to moles of THAT PARTICULAR substance, use that number of moles in the BALANCED chemical equation in order to get the moles/grams/liters/particles of some other reactant or product in the reaction.
We then discussed the 4 postulates/assumptions required to derive (on paper, even!) the ideal gas law.
Any gas that eschews/deviates from those four postulates due to, say, low temperature and/or high pressure, will no longer obey the ideal gas equation.
Van der Waal's, in order to make the ideal gas equation "work" for real gases, developed EMPIRICALLY/VIA EXPERIMENT some "correction factors", "a" and "b", to account for the actual intermolecular attractions ("a") that exist between all gas molecules and to account for the actual particle volumes ("b") that each gas molecule has.
Bio 6/7- we reviewed transcription and translation, looking at several more detailed diagrams of the processes.
We finished our plant and animal cell mitosis lab discussion and then we began a lab simulation in which you "became"/acted out the mRNA and tRNA molecules involved in transcription and translation. You transcribed the DNA code in the nucleus/"front of the room" into an mRNA molecule which then via facilitative diffusion/"went to the ribosomes at the back of the room" where particular tRNA anticodons were attracted to the mRNA codons of your mRNA molecule. You wrote down the sequence of amino acids that were brought along by the tRNA molecules. For fun, to see what "behavior" the protein caused, we associated the amino acid sequence with a particular sequence of words/ a sentence that caused a particular behavior.
Bio 8- we reviewed transcription and translation, looking at several more detailed diagrams of the processes. We also finished our plant and animal cell mitosis lab discussion.
# posted by C @ 1:16 PM 
