Monday, April 30, 2007

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

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