Monday, February 7, 2011
Mon-Day 2
Physics - introduced a different type of circuit: the parallel circuit, and examined how the current gets split at each parallel branch in the circuit. The circuit basically consists of two or more completely independent loops that are connected to the voltage source as if each was the only part of the circuit.
The difficult calculation is getting the overall equivalent resistance of the circuit, which decreases with each resistor added in parallel.
AP Chem -
Kinetics exam on Wednesday.
Expect the following question types:
Complete explanation of HOW each factor that can affect the rate of a reaction does so:
Explanation must be in terms of collision frequency, fraction of particles with proper orientation for an effective collision, fraction of molecules that meet or exceed the activation energy for an effective collision, and overall effective collision frequency. You should use made up numbers in your explanation.
Calculation of rate of reaction (from graphs or data) from rate of appearance or disappearance of products or reactants, respectively.
Determination of rate law, order of reaction overall, and for each reactant, from data table and from graphed data.
Assessing the plausibility of reaction mechanisms, after the rate law has been experimentally determined, and relating the rate law to the mechanism.
Determination and explanation of catalysts and intermediates in reaction mechanisms.
Explanation/determination of catalysts and intermediates on energy/enthalpy diagrams.
Time-dependent rate law calculations from data tables, graphs, or time/concentration data.
Using the two versions of the Arrhenius equation to determine activation energy or rate constant at a second temperature, given graphs or data table of rate constant vs. inverse temperature, or given appropriate data.
Knowledge of any graphical representation of any order rate law.
We reviewed equilibrium constant expressions in terms of concentrations or in terms of partial pressures of gases (if any).
Large K values indicate that the PRODUCTS are "favored" at EQUILIBRIUM.
Small K values indicate that the REACTANTS are "favored" at EQUILIBRIUM.
We saw that, when the equation stoichiometric coefficients are multiplied by a given factor, x, that the resulting equilibrium constant is taken to that EXPONENT, x.
When the products and reactants are written in reverse, the resulting K is
the RECIPROCAL of the original K.
We also showed how to combine the equilibrium constants from several reactions; addition of reactions causes the MULTIPLICATION of the respective equilibrium constants to get the NET equilibrium constant for the overall reaction.
The difficult calculation is getting the overall equivalent resistance of the circuit, which decreases with each resistor added in parallel.
AP Chem -
Kinetics exam on Wednesday.
Expect the following question types:
Complete explanation of HOW each factor that can affect the rate of a reaction does so:
Explanation must be in terms of collision frequency, fraction of particles with proper orientation for an effective collision, fraction of molecules that meet or exceed the activation energy for an effective collision, and overall effective collision frequency. You should use made up numbers in your explanation.
Calculation of rate of reaction (from graphs or data) from rate of appearance or disappearance of products or reactants, respectively.
Determination of rate law, order of reaction overall, and for each reactant, from data table and from graphed data.
Assessing the plausibility of reaction mechanisms, after the rate law has been experimentally determined, and relating the rate law to the mechanism.
Determination and explanation of catalysts and intermediates in reaction mechanisms.
Explanation/determination of catalysts and intermediates on energy/enthalpy diagrams.
Time-dependent rate law calculations from data tables, graphs, or time/concentration data.
Using the two versions of the Arrhenius equation to determine activation energy or rate constant at a second temperature, given graphs or data table of rate constant vs. inverse temperature, or given appropriate data.
Knowledge of any graphical representation of any order rate law.
We reviewed equilibrium constant expressions in terms of concentrations or in terms of partial pressures of gases (if any).
Large K values indicate that the PRODUCTS are "favored" at EQUILIBRIUM.
Small K values indicate that the REACTANTS are "favored" at EQUILIBRIUM.
We saw that, when the equation stoichiometric coefficients are multiplied by a given factor, x, that the resulting equilibrium constant is taken to that EXPONENT, x.
When the products and reactants are written in reverse, the resulting K is
the RECIPROCAL of the original K.
We also showed how to combine the equilibrium constants from several reactions; addition of reactions causes the MULTIPLICATION of the respective equilibrium constants to get the NET equilibrium constant for the overall reaction.
# posted by C @ 6:38 PM 
