Monday, May 28, 2007

Monday: Finally Ms. K is here.
the topic for the day is about Acid and Base Dissociation Constant.
Acid Dissociation Constant:
- strong acids/base dissociate completely :. do not establish equilibrium
- if Ka > 1 = strong acid
- weak acids/base - establish equilibrium
- The equilibrium law: Ka= [H₃O⁺][A^-] / [HA]
-the Ka reflects the equilibrium that exists for as acid

Kb=[B⁺][OH^-] / [BOH]

-the larger the Ka/Kb, the stronger the acid/base.
-the smaller the Ka/Kb, the weaker the acid/base.

that's about it.

note: June 1, due date of research project

: )

Kinetics Assignment #4

Friday, April 13, 2007

Ms. K was not around and we have a substitute, Ms. McQueen. We just went over the Kinetics assignment # 4 and she gave us some hand outs on RATE LAW.
So for those who missed class and wasn't able to get the answer to the Kinetics assignment #4, here you go:

1. 2H₂O₂ ----> 2H₂O + O₂














2. (a) 2P + Q + S ----> R + T + W
(b) Slow
(c) Both P & Q are present in the rate limiting step and since S is not in the rate limiting step it does not affect the rate of of the net reaction. Only the reactants in the rate-
limiting step will significantly affect the rate of the reaction.


3. (a) The RDS is step 1 : C₆H₆ + NO₂⁺ ----> C₆H₆NO₂⁺
Because it's the slow reaction.
(b) C₆H₆ + NO₂^{+ ---->} C₆H₆NO₂⁺ + H^+
(c) H₂SO₄ is introduced in step 2 and is unchanged at the end of the reaction. H₂SO₄ is most likely a catalyst sine it speeds up the reaction but is unchanged at the end of the reaction
(d)




Step 1 Ea 1 Increase (longest)
Step 2 Ea 2 Decrease (smallest)
Step 3 Ea (small)






4. (a) The rate Increase
(b) p + 3Q ----> Z + Y
(c) The RDS is Step 2: A + 2Q ----> X + Y because it has the lowest rate of reaction.

so thats about it. see you all monday.....

next scribe is forgHa_baybhie

TEST DAY!!!

hi everyone,

today was our very first test for chemistry 12. Hooray!!!!!

how was the test?

If you didn't bother to look and answer Ms. Kozoriz's hand outs, then you'll probably have had a hard time with the test.

the contents of the test is pretty much everything that we did in the previous week.

In my own opinion it was ok.

But I did have a problem with the mole part that is worth 4 marks, i think i got that one wrong.
I hope ms. K would be generous to at least give 1 mark for effort on trying to solve the problem.

so good luck to us all. and i hope everyone did well for this exam.

i really don't know what else to say.....

special date: FEB 26-27: get ready to name 12 chemicals.
question: are we suppose to pass a written report/research on the Test Tube Mystery Lab?

our next scribe is forgHa_baybhie