Wednesday, October 19, 2011
Wednes-Day 1
AP Chem - now posted on Edline are many review problems, worksheets, practice test questions. Get started on studying for the next unit exam - we have only three more subtopics in this unit.
we discussed the Dalton's Law of Partial Pressure/Ideal Gas Law problem involving a gas collected over water, a process that automatically introduces water vapor as one of the gases contributing to the total pressure. We looked at an animation of this process - see Edline.
We then looked at one and did another gas stoichiometry problem involving a conventional "two-bulb" setup in which the gases are initially separated, each with unique conditions, and then combined and (usually) reacted. The extra steps in this problem involve finding the limiting reactant, using that to determine the moles of product(s), and determining the partial pressures of all remaining gases while noting that the volume of the container is now larger (because the valve between the bulbs is open).
We began to make 0.100 M solutions of various salts for our qualitative analysis lab.
Bio - there are MANY practice worksheets and quizzes on Edline, to help you to prepare for Friday's exam! Do each of them for review, and see me at extra help if you have any difficulty.
we discussed how to use indicators to "see" evidence of particular substances.
We then applied that to a cell model example, in which we drew where substances would diffuse or not depending on the TWO main factors that determine permeability through a cell membrane:
1. the SIZE of the particles (molecules or ions)
2. the charge or polarity of a particle.
In 10/11, we began the State Lab on Diffusion/Using Indicators by looking at the effect of hypertonic and hypotonic solutions on onion cells.
we discussed the Dalton's Law of Partial Pressure/Ideal Gas Law problem involving a gas collected over water, a process that automatically introduces water vapor as one of the gases contributing to the total pressure. We looked at an animation of this process - see Edline.
We then looked at one and did another gas stoichiometry problem involving a conventional "two-bulb" setup in which the gases are initially separated, each with unique conditions, and then combined and (usually) reacted. The extra steps in this problem involve finding the limiting reactant, using that to determine the moles of product(s), and determining the partial pressures of all remaining gases while noting that the volume of the container is now larger (because the valve between the bulbs is open).
We began to make 0.100 M solutions of various salts for our qualitative analysis lab.
Bio - there are MANY practice worksheets and quizzes on Edline, to help you to prepare for Friday's exam! Do each of them for review, and see me at extra help if you have any difficulty.
we discussed how to use indicators to "see" evidence of particular substances.
We then applied that to a cell model example, in which we drew where substances would diffuse or not depending on the TWO main factors that determine permeability through a cell membrane:
1. the SIZE of the particles (molecules or ions)
2. the charge or polarity of a particle.
In 10/11, we began the State Lab on Diffusion/Using Indicators by looking at the effect of hypertonic and hypotonic solutions on onion cells.
# posted by C @ 2:13 PM 
