Wednesday, March 21, 2007
Wednes-Day 4
Honors: we had our Math of Chem 3: Gas Laws exam. I will grade them over the next few days; so far, I glanced at two tests of students who come to extra help and they were both perfect except for one minor problem involving circular reasoning (NOTE: circular reasoning means trying to explain a statement by just restating the statement: "I always tell the truth BECAUSE I never lie" is an example of circular reasoning. Don't ever use that type of "reasoning". It is meaningless).
Hope to see more of those high scores.
Regents: we talked about specific heat capacity. Qualitatively, substances with high specific heats require a lot of energy to heat up and these substances have to lose a lot of energy to cool down. Water has a relatively high specific heat capacity.
We then did a calorimetry problem in which we determined the specific heat of an object. This was determined via calorimetry during which heat is exchanged between the hot object and the cooler water.
We then just started our new topic: Kinetics and Equilibrium.
MAKE SURE that your labs are all up to date by Monday.
AP: we further discussed salts that are more soluble in lower pH/ more acidic solutions. We then did a quantitative comparison of the solubility of magnesium hydroxide in water vs. in a relatively acidic buffer solution.
We then played "will a precipitate form?" and solved for the grams of precipitate and % precipitation. We will do another selective precipitation problem tomorrow and then we will begin one of the final topics: Thermodynamics i.e. dG = dH -TdS
Hope to see more of those high scores.
Regents: we talked about specific heat capacity. Qualitatively, substances with high specific heats require a lot of energy to heat up and these substances have to lose a lot of energy to cool down. Water has a relatively high specific heat capacity.
We then did a calorimetry problem in which we determined the specific heat of an object. This was determined via calorimetry during which heat is exchanged between the hot object and the cooler water.
We then just started our new topic: Kinetics and Equilibrium.
MAKE SURE that your labs are all up to date by Monday.
AP: we further discussed salts that are more soluble in lower pH/ more acidic solutions. We then did a quantitative comparison of the solubility of magnesium hydroxide in water vs. in a relatively acidic buffer solution.
We then played "will a precipitate form?" and solved for the grams of precipitate and % precipitation. We will do another selective precipitation problem tomorrow and then we will begin one of the final topics: Thermodynamics i.e. dG = dH -TdS
# posted by C @ 6:18 PM 
