Tuesday, February 24, 2009
Tues-Day 1
AP Chem- took the multiple choice part of the Gas-solid eq. exam. We continued our discussion of Bronsted acid base conjugate pairs, which we will come back to later.
We then went over the definition and derivation of the pH scale. The higher the hydronium ion concentration in any aqueous solution, the LOWER the pH (by definition due to the NEGATIVE log of the hydronium ion concentration).
We learned how to quickly estimate pH (and pOH) of a given solution given the hydronium or hydroxide ion concentration.
For example, since the pH of a 1.0 x 10^-5 molar solution of any strong acid is 5.0,
the pH of a 2.0 x 10^-5 molar solution of any strong acid must be just BELOW 5.0 (higher acid concentration, lower pH), so we estimate it to be about 4.3 or 4.4.
Notice that a solution that is TWICE as "acidic" does NOT have HALF the pH value because that is a logarithmic scale is not linearly proportional.
The descriptive chemistry review sessions will be held right after school on Wednesday and Thursday for one hour each. I will do multiple examples of each question type from formula writing through formula equation through net ionic equation through balancing.
I want and I hope that you want this significant part of the course to ultimately be quick, free, and easy points for you. Of course, a lot of practice goes into making that goal a reality.
Bio 6/7- we saw and discussed videos on the nervous system purpose, function, and subdivisions. We corrected my blunder regarding the direction of a nerve impulse (nobody's perfect, hmm?) by showing the logic of having many more neurotransmitter RECEPTORS along the high surface area DENDRITE (head) of the nerve cell and the neurotransmitter secreting vesicles at the terminal branch (tail) of the neuron.
We then discussed and described a complete reflex arc from stimulus (stimulation) of receptors in the sense organs to sensory neurons to interneurons to motor neurons to effectors (muscles or glands) which causes the response.
Bio 8-we saw and discussed videos on the nervous system purpose, function, and subdivisions. We corrected my blunder regarding the direction of a nerve impulse (nobody's perfect, hmm?) by showing the logic of having many more neurotransmitter RECEPTORS along the high surface area DENDRITE (head) of the nerve cell and the neurotransmitter secreting vesicles at the terminal branch (tail) of the neuron.
We then went over the definition and derivation of the pH scale. The higher the hydronium ion concentration in any aqueous solution, the LOWER the pH (by definition due to the NEGATIVE log of the hydronium ion concentration).
We learned how to quickly estimate pH (and pOH) of a given solution given the hydronium or hydroxide ion concentration.
For example, since the pH of a 1.0 x 10^-5 molar solution of any strong acid is 5.0,
the pH of a 2.0 x 10^-5 molar solution of any strong acid must be just BELOW 5.0 (higher acid concentration, lower pH), so we estimate it to be about 4.3 or 4.4.
Notice that a solution that is TWICE as "acidic" does NOT have HALF the pH value because that is a logarithmic scale is not linearly proportional.
The descriptive chemistry review sessions will be held right after school on Wednesday and Thursday for one hour each. I will do multiple examples of each question type from formula writing through formula equation through net ionic equation through balancing.
I want and I hope that you want this significant part of the course to ultimately be quick, free, and easy points for you. Of course, a lot of practice goes into making that goal a reality.
Bio 6/7- we saw and discussed videos on the nervous system purpose, function, and subdivisions. We corrected my blunder regarding the direction of a nerve impulse (nobody's perfect, hmm?) by showing the logic of having many more neurotransmitter RECEPTORS along the high surface area DENDRITE (head) of the nerve cell and the neurotransmitter secreting vesicles at the terminal branch (tail) of the neuron.
We then discussed and described a complete reflex arc from stimulus (stimulation) of receptors in the sense organs to sensory neurons to interneurons to motor neurons to effectors (muscles or glands) which causes the response.
Bio 8-we saw and discussed videos on the nervous system purpose, function, and subdivisions. We corrected my blunder regarding the direction of a nerve impulse (nobody's perfect, hmm?) by showing the logic of having many more neurotransmitter RECEPTORS along the high surface area DENDRITE (head) of the nerve cell and the neurotransmitter secreting vesicles at the terminal branch (tail) of the neuron.
# posted by C @ 10:28 AM 
