Wednesday, September 29, 2010
Tues-Day 2
Physics - we did ditto 2 from the straight-line motion packet, and then analyzed graph II, again relating the speed vs. time graph to a distance vs. time sketch for the same object's motion.
AP Chem - started our new unit on Stoichiometry. We discussed the MEANING of the coefficients of a BALANCED chemical equation in terms of MOLES of atoms, molecules, formula units of the various types of substances.
We then, by analogy, showed that when reactants are not mixed PROPORTIONALLY to their "recipe" amounts, an excess of one reactant remains; the other "limiting" reactant, determines the quantity of each product formed.
We showed the ONLY MOLE RATIOS can be used in determining limiting and excess reactants.
We defined the term "mole of reaction".
We then introduced our percent composition of a hydrate lab, noting proper weighing technique and some sources of error.
AP Chem - started our new unit on Stoichiometry. We discussed the MEANING of the coefficients of a BALANCED chemical equation in terms of MOLES of atoms, molecules, formula units of the various types of substances.
We then, by analogy, showed that when reactants are not mixed PROPORTIONALLY to their "recipe" amounts, an excess of one reactant remains; the other "limiting" reactant, determines the quantity of each product formed.
We showed the ONLY MOLE RATIOS can be used in determining limiting and excess reactants.
We defined the term "mole of reaction".
We then introduced our percent composition of a hydrate lab, noting proper weighing technique and some sources of error.
# posted by C @ 10:35 AM 
