Friday, November 7, 2008
Fri-Day 2
AP Chem- The ONLY (there CANNOT be any more quarterly bonus tests for the rest of this course) quarterly bonus test for the year will be given on Monday after school (starting some time between 3:45 PM and 4:00 PM) in Room 308. The objectives covered on this MULTIPLE CHOICE TEST will be posted on Blackboard this weekend. You should RETAKE ALL of your previous tests and quizzes from the first quarter to START your review. Let the ease or difficulty of these past tests guide the rest of your study. ALL previous unit files and practice tests are STILL on Blackboard. This 100 point test cannot hurt your quarterly average; it can only help further prepare you for the AP exam and possibly help your first quarter average.
We applied Graham's Law of Effusion to two problems in which we compared the relative RATES of effusion of two different gases and then used the relative times of effusion in order to determine the molar mass of an unknown gas.
The ideal gas law can be used to derive (we didn't go through that; unnecessary) the average (root mean squared) speed of a molecule because T is a measure of average kinetic energy and average kinetic energy is proportional to the mass of the molecule times its velocity squared.
We saw that the official AP CHEMISTRY REFERENCE TABLE foolishly gives a "wrong" version of the rms (average) speed of a gas molecule at a given Kelvin temperature. To correct the formula so that we can use the common molar mass measurement of grams per mole, you must change the "3" to a "3000" and use the units of grams per kg. Then, the Joule unit (from "R") will cancel and you will be left with the speed in meters per second.
We then revisited Dalton's Law of Partial Pressure, which is frequently used in gas stoichiometry problems in which the lab procedure dictates that the gaseous product be collected over WATER. This ALWAYS (at ANY temperature) causes the collected gas to be mixed with water vapor (a gas!). Therefore, Dalton's formula must be used.
Bio 6- we reviewed TRANSCRIPTION and then focused on the subsequent process of TRANSLATING the mRNA code/sequence of RNA bases to a sequence of amino acids that form the "trait-causing" protein. We saw the tRNA is required to complement/pair with mRNA triplets/codons. Each particular tRNA anti-codon will cause a particular amino acid to be attached/bonded to the tRNA molecule. We saw the mRNA codon chart that shows the particular amino acid that will be transferred by the tRNA at the ribosome to make the amino acid chain/protein.
I will post a translation video on Blackboard this weekend. I will also put your lab grades up this weekend (except for the whitefish blastula/onion root tip mitosis lab IF you didn't finish that yet).
Bio 7/8- we reviewed TRANSCRIPTION and then focused on the subsequent process of TRANSLATING the mRNA code/sequence of RNA bases to a sequence of amino acids that form the "trait-causing" protein. We saw the tRNA is required to complement/pair with mRNA triplets/codons. Each particular tRNA anti-codon will cause a particular amino acid to be attached/bonded to the tRNA molecule. We saw the mRNA codon chart that shows the particular amino acid that will be transferred by the tRNA at the ribosome to make the amino acid chain/protein.
We then finished our plant and animal cell mitosis lab; we will quickly discuss the questions on Monday so that the lab can be entered last minute for the first quarter.
We applied Graham's Law of Effusion to two problems in which we compared the relative RATES of effusion of two different gases and then used the relative times of effusion in order to determine the molar mass of an unknown gas.
The ideal gas law can be used to derive (we didn't go through that; unnecessary) the average (root mean squared) speed of a molecule because T is a measure of average kinetic energy and average kinetic energy is proportional to the mass of the molecule times its velocity squared.
We saw that the official AP CHEMISTRY REFERENCE TABLE foolishly gives a "wrong" version of the rms (average) speed of a gas molecule at a given Kelvin temperature. To correct the formula so that we can use the common molar mass measurement of grams per mole, you must change the "3" to a "3000" and use the units of grams per kg. Then, the Joule unit (from "R") will cancel and you will be left with the speed in meters per second.
We then revisited Dalton's Law of Partial Pressure, which is frequently used in gas stoichiometry problems in which the lab procedure dictates that the gaseous product be collected over WATER. This ALWAYS (at ANY temperature) causes the collected gas to be mixed with water vapor (a gas!). Therefore, Dalton's formula must be used.
Bio 6- we reviewed TRANSCRIPTION and then focused on the subsequent process of TRANSLATING the mRNA code/sequence of RNA bases to a sequence of amino acids that form the "trait-causing" protein. We saw the tRNA is required to complement/pair with mRNA triplets/codons. Each particular tRNA anti-codon will cause a particular amino acid to be attached/bonded to the tRNA molecule. We saw the mRNA codon chart that shows the particular amino acid that will be transferred by the tRNA at the ribosome to make the amino acid chain/protein.
I will post a translation video on Blackboard this weekend. I will also put your lab grades up this weekend (except for the whitefish blastula/onion root tip mitosis lab IF you didn't finish that yet).
Bio 7/8- we reviewed TRANSCRIPTION and then focused on the subsequent process of TRANSLATING the mRNA code/sequence of RNA bases to a sequence of amino acids that form the "trait-causing" protein. We saw the tRNA is required to complement/pair with mRNA triplets/codons. Each particular tRNA anti-codon will cause a particular amino acid to be attached/bonded to the tRNA molecule. We saw the mRNA codon chart that shows the particular amino acid that will be transferred by the tRNA at the ribosome to make the amino acid chain/protein.
We then finished our plant and animal cell mitosis lab; we will quickly discuss the questions on Monday so that the lab can be entered last minute for the first quarter.
# posted by C @ 10:41 AM 
