Wednesday, January 31, 2007
Wednesday, Day 7
Honors: took our bonding/IMFA test; results and analysis by early next week; some of you are going to have to correct your corrections from the last test; I will not be giving that opportunity again: get it right the first time; if not, get it right the second time but that is the limit.
Regents: Today, we began, in earnest, our NEW unit: the Math of Chemistry. We learned how to balance an equation by mass and charge; we will be doing many more examples of this problem type on Friday. We then looked at three different types of chemical reaction: synthesis, decomposition, and single replacement. On Friday, we will learn two more common reaction types. Tomorrow is your third and final bonding/intermolecular forces exam. Serious practice and study is required for this unit especially after the lab exam debacle.
I will be in at around 7:30AM if you have any last minute questions tomorrow.
AP: we wrote equilibrium constant EXPRESSIONS in terms of concentrations, Kc, and also in terms of partial pressures, Kp.
We also practiced with the formula that interrelates Kc and Kp; that formula is in your reference table. What is NOT in the table is how to calculate "delta n" in that formula; we discussed that in class.
We then looked at a heterogeneous solid-gas equilibrium and saw the disturbing and surprising result that AMOUNTS of SOLIDS are IRRELEVANT to EQUILIBRIUM GAS concentrations or pressures because SOLIDS are NOT in the equilibrium constant EXPRESSION! More on this empirically discovered fact tomorrow.
For tonight, start on Chapter 15 with the first section.
Regents: Today, we began, in earnest, our NEW unit: the Math of Chemistry. We learned how to balance an equation by mass and charge; we will be doing many more examples of this problem type on Friday. We then looked at three different types of chemical reaction: synthesis, decomposition, and single replacement. On Friday, we will learn two more common reaction types. Tomorrow is your third and final bonding/intermolecular forces exam. Serious practice and study is required for this unit especially after the lab exam debacle.
I will be in at around 7:30AM if you have any last minute questions tomorrow.
AP: we wrote equilibrium constant EXPRESSIONS in terms of concentrations, Kc, and also in terms of partial pressures, Kp.
We also practiced with the formula that interrelates Kc and Kp; that formula is in your reference table. What is NOT in the table is how to calculate "delta n" in that formula; we discussed that in class.
We then looked at a heterogeneous solid-gas equilibrium and saw the disturbing and surprising result that AMOUNTS of SOLIDS are IRRELEVANT to EQUILIBRIUM GAS concentrations or pressures because SOLIDS are NOT in the equilibrium constant EXPRESSION! More on this empirically discovered fact tomorrow.
For tonight, start on Chapter 15 with the first section.
# posted by C @ 5:26 PM 
