Friday, February 27, 2009
Fri-Day 2
AP Chem- focused on relative strengths of acids. You already know the six strong acids but why are these acids 100% ionized in aqueous solution?
TWO and only two factors:
1. bond polarity i.e. the more polar the H-X bond, the more that the H atom is practically almost an H+ ion ready to ionize. Bond polarity gets significantly greater as you consider X (of H-X) from left to right across a PERIOD (due to the increasing Zeff of the X bonded to the H).
2. bond strength (as determined by bond length) i.e. the stronger the attractions for the shared electrons in the bond, the more energy required for the H-X bond to be broken. Bond strength gets significantly weaker as you consider element X DOWN a group.
Reminder to attend extra help on Monday morning to ask questions about Wednesday's exam.
I didn't post hw problems for this unit so I am not going to do so now. I will post the questions and solutions to many acid-base hw questions so you can practice with them and then check your work instantly.
I will also post a couple of past AP questions for you to work on this weekend in order to help you continue to prepare for the AP exam.
Solutions will be posted on Monday.
After school on Monday, if you desire to take a timed/proctored practice acid-base equilibrium test, you may do so.
Bio 6- reviewed common diseases or the nervous system. We then did two worksheets on the brain and central nervous system.
Bio 7/8- we reviewed the locations of the central and peripheral nervous system and then discussed specific examples of actions or behaviors that are controlled by the somatic and autonomic nervous systems. We showed the opposite effects of a sympathetic autonomic response and a parasympathetic autonomic response.
We then looked at the structure of the brain and discussed the function of its three broad main parts: the cerebrum, the cerebellum, and the medulla oblongata.
We briefly discussed four disorders/diseases of the brain and/or nervous system.
We then collected data to test the following hypothesis: doing another activity simultaneously will decrease your reaction time in catching an object.
TWO and only two factors:
1. bond polarity i.e. the more polar the H-X bond, the more that the H atom is practically almost an H+ ion ready to ionize. Bond polarity gets significantly greater as you consider X (of H-X) from left to right across a PERIOD (due to the increasing Zeff of the X bonded to the H).
2. bond strength (as determined by bond length) i.e. the stronger the attractions for the shared electrons in the bond, the more energy required for the H-X bond to be broken. Bond strength gets significantly weaker as you consider element X DOWN a group.
Reminder to attend extra help on Monday morning to ask questions about Wednesday's exam.
I didn't post hw problems for this unit so I am not going to do so now. I will post the questions and solutions to many acid-base hw questions so you can practice with them and then check your work instantly.
I will also post a couple of past AP questions for you to work on this weekend in order to help you continue to prepare for the AP exam.
Solutions will be posted on Monday.
After school on Monday, if you desire to take a timed/proctored practice acid-base equilibrium test, you may do so.
Bio 6- reviewed common diseases or the nervous system. We then did two worksheets on the brain and central nervous system.
Bio 7/8- we reviewed the locations of the central and peripheral nervous system and then discussed specific examples of actions or behaviors that are controlled by the somatic and autonomic nervous systems. We showed the opposite effects of a sympathetic autonomic response and a parasympathetic autonomic response.
We then looked at the structure of the brain and discussed the function of its three broad main parts: the cerebrum, the cerebellum, and the medulla oblongata.
We briefly discussed four disorders/diseases of the brain and/or nervous system.
We then collected data to test the following hypothesis: doing another activity simultaneously will decrease your reaction time in catching an object.
# posted by C @ 3:08 PM 
