Wednesday, May 09, 2007
Wednes-Day 3
AP: The seven of you who "cut" class today can catch up on what was discussed:
we did a part II section today reviewing cis-trans isomerism; there is no rotational freedom for double or triple bonded carbons because the pi bond would break if the C's could rotate. Therefore, cis-trans isomerism involves temporarily breaking the C=C double bond; the single bond rotates until the cis groups are trans oriented and then the double bond reforms, or vice-versa.
We also did the gas stoichiometry question. Remember, for the last part, to get the overall Keq from the equations that have been ADDED, you must MULTIPLY the K's of each added equation. We proved this in the notes during the first part of the acids/bases unit. Also, when you double everything in an equation, you must take K to the 2nd power in order to get the consistent value. If you halve all coefficients in a balanced equation, you must take the square root (half power) of the K of the original equation.
We did the titration lab question with error analysis and saw that lab question only SEEMS scary but it is actually one of the easiest questions.
The key to unmasking ANY AP question is to read the question CAREFULLY = AT LEAST TWO TIMES! Each AP question provides you with clues and a roadmap as to what you have to do to logically and efficiently solve the problem. If you do not see those clues, you probably misread the question or you are not looking at the other parts of the problem to see how they can be used in solving the current question.
Tomorrow, we will decipher another part II. This Saturday, I will give another full AP (1999) for those who want to come in; if you can't make the test, be sure to pick up a copy of the test to do for that (final) weekend.
Honors: we discussed redox and learned the standard rules for ASSIGNING oxidation numbers. Armed with these assigned numbers, we can see which elements get oxidized or reduced in a reaction. We will continue with that process, tomorrow.
Remember: NGER and POLE.
Regents: we discussed redox and learned the standard rules for ASSIGNING oxidation numbers. Armed with these assigned numbers, we can see which elements get oxidized or reduced in a reaction. We will continue with that process, tomorrow.
we did a part II section today reviewing cis-trans isomerism; there is no rotational freedom for double or triple bonded carbons because the pi bond would break if the C's could rotate. Therefore, cis-trans isomerism involves temporarily breaking the C=C double bond; the single bond rotates until the cis groups are trans oriented and then the double bond reforms, or vice-versa.
We also did the gas stoichiometry question. Remember, for the last part, to get the overall Keq from the equations that have been ADDED, you must MULTIPLY the K's of each added equation. We proved this in the notes during the first part of the acids/bases unit. Also, when you double everything in an equation, you must take K to the 2nd power in order to get the consistent value. If you halve all coefficients in a balanced equation, you must take the square root (half power) of the K of the original equation.
We did the titration lab question with error analysis and saw that lab question only SEEMS scary but it is actually one of the easiest questions.
The key to unmasking ANY AP question is to read the question CAREFULLY = AT LEAST TWO TIMES! Each AP question provides you with clues and a roadmap as to what you have to do to logically and efficiently solve the problem. If you do not see those clues, you probably misread the question or you are not looking at the other parts of the problem to see how they can be used in solving the current question.
Tomorrow, we will decipher another part II. This Saturday, I will give another full AP (1999) for those who want to come in; if you can't make the test, be sure to pick up a copy of the test to do for that (final) weekend.
Honors: we discussed redox and learned the standard rules for ASSIGNING oxidation numbers. Armed with these assigned numbers, we can see which elements get oxidized or reduced in a reaction. We will continue with that process, tomorrow.
Remember: NGER and POLE.
Regents: we discussed redox and learned the standard rules for ASSIGNING oxidation numbers. Armed with these assigned numbers, we can see which elements get oxidized or reduced in a reaction. We will continue with that process, tomorrow.
# posted by C @ 3:14 PM 
