Chemistry

today in chemistry class we started by watching a cool video explaining Le Chatelier's Principle, he states that when a system is at equilibrium and subjected to a stress, the system will adjust to relieve the stress but changing concentrations by adding or removing products or reactants to the reaction, changing the pressure of gaseous reactants and products and changing the temperature will affect the outcome of the equilibrium and therefore will have to first determine what needs to happen for the reaction to get back to equilibrium.

Change in concentrations example:

A + B <--> C

- if you add more A, the equilibrium shifts to the right producing more C
- if you add more B, the equilibrium shifts to the right producing more C
- if you add more C, the equilibrium shifts to the left producing more A & B

Change in pressure

A + B <--> C

- an increase in pressure will cause a shift to the right, producing more C (product)

Change in temperature

A + B <--> C

- the shift caused by a change in temperature depends whether the reaction is exothermic or endothermic
- increasing the temperature will cause a shift to the left using the excess heat and an increase in forward reaction would produce even more heat because it is exothermic reaction.

Thus conclude me scribe post aaaaaaaarrrrrrr....

have you guys seen a blue folder with killer whales? waaaaahhh please give it to me if you find it because all my chem. stuff are in there waaaaaaaahhhhhhhhhh......KEER i choose you to be the next scribe

ruschev

Le Chatelier Problems

April 25, 2007

Soooo im today's scribe :) buahahah no one will ever know who i am... ?!?! or will they?! k whatever. i really dont care. but it was funny when he tried to figure out who i was :) sneaky lil me. okay anyways. back to chemistry...

Ms K handed our 4 & 5 questions back and we went over them since some had trouble...(me). haha. k yeea anyways. The steps are on the previous blog Ms K had posted up for us.

We then went over the homework assigned yesterday in the yellow booklet questions 1-6. So if you weren't able to keep up or you either didn't do them. I think you should go over the slide and copy BUT understand what is going on as well :))

Another thing we did today was something new. whoo hoo!

Reaction Quotient = Q or we know it as TRIAL K_c

reaction quotient helps us figure out whether or not the reaction is favoured (forward or reversed) in order for equilibrium to happen.

Previous slide will help you understand a lil more on what is favoured between Q and K.

There is also an example in the white booklet which will also help you understand this concept of Reaction Quotient. It's quite easy once you read over and do the work assigned

BTW: there's homework :) YAY! Lesson 3 Homework Assignment 6-10.

next scribe i will choose will be...ROMINA

Equilibrium Problems/Reaction Quotient

Scribe post

Today all we did was attend a assembly that was reminder to all grade 12's to graduate. We were assigned 1-6 in the yellow booklet under Chem Equilibrium assignment. And a reminder to the people that skipped the class, Hand in Equilibrium lab & 4 and 5 from Lesson 3.


The next scribe is BOOT5.................

Blog: Monday, April 23, 2007.

What we did Monday, April 23, 2007.

REMINDER: "Grade 12 Chemistry: Chemical Equilibrium Experiment" is due.

- We started off the class by reading from the "Grade 12 Chemistry: Chemical Equilibrium" booklet. Page 11 - Page 13.

Page 11, "Calculating Equilibrium Concentration."

If the equilibrium constant is given, the concentration of one of the reactants or products can be calculated if the other values are given as well.

Examples & Solutions are given.

- Then we practiced with problems provided in our yellow booklets labeled "Equilibrium Project Assignment."

Page 4, Lesson 3 Homework Assignment.

We answered #1 - #3 in class.

Answers to #1, refer to page 3 & 4 on Ms. Kozoriz's "Monday ICE Problems."

Answers to #2, refer to page 5 & 6 on Ms. Kozoriz's "Monday ICE Problems."

Answers to #3, refer to page 7 & 8 on Ms. Kozoriz's "Monday ICE Problems."

Finish "Lesson 3 Homework Assignment," #4 & #5

That's the end of what we did in class.

The next scribe is: Allen.

Monday's ICE problems