Monday, February 2, 2009
Mon-Day 2
AP Chem- we reviewed the meaning of "rate law" and the definition of rate as well as the derivation of the TIME DEPENDENT 1st order rate law equation (we use the ratio version similar to the one in the AP reference tables). We then derived the 0th order time dependent rate law and compared that to the 1st order rate law both numerically and graphically.
We reviewed the units of various order rate law rate constants.
We then applied the 1st order time dependent rate law equation to a couple of examples.
We showed the special case of "half-life" time, which is merely finding the time at which HALF of the original concentration remains. In other words, just substitute 0.5 x [A]original into any time dependent equation to determine the half-life time.
For first order reactions, the half-life time is INDEPENDENT of original concentration because the ratio of [A]t to [A]o is always 0.5 and the natural log of 0.5 is -.693.
We will have a brief (you need to do these problems QUICKLY and ACCURATELY, which is why I have posted so many practice sets!) descriptive chem quiz at the beginning of class. Don't be late.
We will derive the 2nd order time dependent rate law tomorrow.
Bio- took the circulatory, respiratory, and excretory systems exam today.
Bio 7/8 also almost finished the resting vs. post exercise lab discussion.
Tomorrow we begin our new unit on the human IMMUNE system.
We reviewed the units of various order rate law rate constants.
We then applied the 1st order time dependent rate law equation to a couple of examples.
We showed the special case of "half-life" time, which is merely finding the time at which HALF of the original concentration remains. In other words, just substitute 0.5 x [A]original into any time dependent equation to determine the half-life time.
For first order reactions, the half-life time is INDEPENDENT of original concentration because the ratio of [A]t to [A]o is always 0.5 and the natural log of 0.5 is -.693.
We will have a brief (you need to do these problems QUICKLY and ACCURATELY, which is why I have posted so many practice sets!) descriptive chem quiz at the beginning of class. Don't be late.
We will derive the 2nd order time dependent rate law tomorrow.
Bio- took the circulatory, respiratory, and excretory systems exam today.
Bio 7/8 also almost finished the resting vs. post exercise lab discussion.
Tomorrow we begin our new unit on the human IMMUNE system.
# posted by C @ 4:16 PM 
