Friday, October 14, 2011
Fri-Day 2
AP Chem - we finished the ideal gas law problem relating gas density to its molar mass.
We then explained in detail, both of Dalton's Laws of gas pressures.
We saw that the sole factor in determining collision frequency of any ideally behaving gas at a given temperature and volume is the number of gas molecules/ moles of gas in the container.
We also saw that different gaseous substances, behaving ideally, act completely INDEPENDENTLY of each other (even though their molecules are colliding together), so they do not at all affect each others NET collision frequencies or partial pressures.
There are more solution stoichiometry practice files on Edline.
There is extra help on Monday morning, as always.
Here is a list of potential question types on Monday's solution stoichiometry exam:
1. the four gas-forming reactions, as well as the two types of previously tested double replacement reactions.
2. redox balancing via the half-reaction method including identification (with reason/definition) of oxidizing agent and reducing agent; you also should be able to recognize common oxidizers such as permanganates, chromates, and dichromates.
3. stoichiometry (from mass) with limiting reactant, and percent yield (still must know past stoichiometry units)
4. molarity calculations
5. making solutions, dilution calculations, concentrations of evaporating saturated solutions.
6. solution stoichiometry/titration (acid/base or redox) to determine the percent composition of a given element or compound in a mixture/ore or to determine the empirical formula of an unknown acid or to determine the molar mass of an acid of known general empirical formula e.g. H2X.
7. solution stoichiometry with limiting reactant, and FINAL concentrations of all non-spectator ions in solution.
Bio - we did one more example of organelles working together to maintain cell homeostasis.
We then discussed and explained the animations of the passive transport (diffusion, osmosis/diffusion of water, facilitated diffusion) and active transport (e.g. the sodium potassium pump in nerve cells).
In 7/8, we finished up the plant vs. animal cell lab, by observing the plant cells of the aquatic plant, Elodea.
We then explained in detail, both of Dalton's Laws of gas pressures.
We saw that the sole factor in determining collision frequency of any ideally behaving gas at a given temperature and volume is the number of gas molecules/ moles of gas in the container.
We also saw that different gaseous substances, behaving ideally, act completely INDEPENDENTLY of each other (even though their molecules are colliding together), so they do not at all affect each others NET collision frequencies or partial pressures.
There are more solution stoichiometry practice files on Edline.
There is extra help on Monday morning, as always.
Here is a list of potential question types on Monday's solution stoichiometry exam:
1. the four gas-forming reactions, as well as the two types of previously tested double replacement reactions.
2. redox balancing via the half-reaction method including identification (with reason/definition) of oxidizing agent and reducing agent; you also should be able to recognize common oxidizers such as permanganates, chromates, and dichromates.
3. stoichiometry (from mass) with limiting reactant, and percent yield (still must know past stoichiometry units)
4. molarity calculations
5. making solutions, dilution calculations, concentrations of evaporating saturated solutions.
6. solution stoichiometry/titration (acid/base or redox) to determine the percent composition of a given element or compound in a mixture/ore or to determine the empirical formula of an unknown acid or to determine the molar mass of an acid of known general empirical formula e.g. H2X.
7. solution stoichiometry with limiting reactant, and FINAL concentrations of all non-spectator ions in solution.
Bio - we did one more example of organelles working together to maintain cell homeostasis.
We then discussed and explained the animations of the passive transport (diffusion, osmosis/diffusion of water, facilitated diffusion) and active transport (e.g. the sodium potassium pump in nerve cells).
In 7/8, we finished up the plant vs. animal cell lab, by observing the plant cells of the aquatic plant, Elodea.
# posted by C @ 1:02 PM 
