Friday, March 4, 2011
Fri-Day 2 Pep Rally Day!
Physics - got into our unit on waves, discussing the common characteristics of longitudinal (particles move parallel to wave direction) and transversal (particles move perpendicular to wave direction) waves.
We further defined, and showed the AMPLITUDE (power, energy, brightness, loudness) of a wave, the FREQUENCY (number of wavelengths passing a given point per second), the WAVELENGTH (a DISTANCE between two EQUIVALENT points on the wave, usually peak to peak is used for convenience), and PERIOD (the number of SECONDS for ONE wavelength to pass by a given point).
We also showed that, with increasing dilution (reviewed the lab process of dilution also), the % ionization of a weak acid increases, THOUGH the pH increases up until you have an infinitely dilute solution that has a pH of 7.
We further defined, and showed the AMPLITUDE (power, energy, brightness, loudness) of a wave, the FREQUENCY (number of wavelengths passing a given point per second), the WAVELENGTH (a DISTANCE between two EQUIVALENT points on the wave, usually peak to peak is used for convenience), and PERIOD (the number of SECONDS for ONE wavelength to pass by a given point).
AP Chem -we discussed the CRUCIAL quantitative technique of learning when to "neglect x relative to the initial concentration of the acid i.e. when the percent ionization is 5% or less i.e. when the initial concentration is 1000x or more the value of the Ka".
With this, we can quickly calculate the equilibrium pH of a given concentration of weak acid, WITHOUT the need for a calculator; even WITH a calculator, the button-pushing is easier with the less complex denominator.We also showed that, with increasing dilution (reviewed the lab process of dilution also), the % ionization of a weak acid increases, THOUGH the pH increases up until you have an infinitely dilute solution that has a pH of 7.
# posted by C @ 4:37 PM 
