SciHawks

AP Chem - the single-period test on Raoult's Law, metal-ligand naming, etc. will be given during the first period of our double on Wednesday (NOT Tuesday). I have posted a practice test that will look like Wednesday's test (though there will be fewer descriptive chem reactions). I will post the answers by/on Tuesday. Practice and study - this should be a slam-dunk hundred.

We explained how catalysts worked by binding reactant molecules, straining their bonds and orienting them in such a way that the proper bonds are broken. This has an activation-energy lowering effect that increases the percent of collisions that have sufficient kinetic energy for bond breakage; ALSO, a catalyst increases the percentage of collisions that have proper orientation for an effective collision. Catalysts do NOT change the average kinetic energies of the reactants.
We then discussed how reaction rates are measured, the convention for measuring the instantaneous initial rate of reaction in terms of any reactant or product , and using that (via the balanced equation) to get the initial rate of a reaction.

Bio - we began our review for the unit test on the endocrine system/regulation and the digestive system/nutrition. Additional practice materials are now posted on Edline.