EQUILIBRUIM SYSTEMS
DEFINE A CLOSED EQUILIBRUIM SYSTEM IN TERMS OF ENERGY AND MATTER?
A closed system is a system that exchanges only energy with its surroundings, not matter.
What does LCP stand for?
Le Châtelier's principle
An equilibrium that STRONGLY favours products and goes to completion has a K value above __________
1 x 10^3
What sport does Mr.Chan occasionally challenge students at on school grounds?
Table Tennis
STATIC
Define LCP
Le Châtelier's principle states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change to reestablish an equilibrium.
The equilibrium constant for the acid ionisation of mercaptoethanol (HSCH2CH2OH) is 1.91 x 10–10.
HSCH2CH2OH(aq) ,<=> H+ (aq) + SCH2CH2OH(aq)
Identify what this Keq value means both in terms of favoured side of reaction and equilibrium position
The equilibrium lies far to the left and is reactant favoured.
What week and day did Mr.Joseph start teaching this class
Week 2 - Monday
Which of the following is true regarding the concentration of products, for a chemical reaction that is already at equilibrium, assuming no disruptions to the equilibrium?
a. The concentrations of products will not change because there are no more reactants.
b. The concentrations of products will not change because the limiting reagent is gone.
c. The concentrations of products will not change because the forward and reverse rates are equal.
d. The concentrations of products will change continually because of reversibility.
C
What are three different ways an equilibrium system can be disrupted?
Change in pressure, temperature, concentration...
On the whiteboard write out the the equilibrium expression for: A + 3B <=> 2C + 4D
[C]2[D]4/[A][B]3
What was the bet made between Mr.Joseph and the class in terms of the Iron thiocyanate practical?
(Bonus 50 points for remembering the correct range)
That I would shave my beard into a moustache if any group got within +/- 10 of the literature value of 130
ON THE WHITEBOARD, DRAW AN IMAGE FOR BOTH CLOSED AND OPEN EQUILIBRUIM SYSTEMS
WHITEBOARD DRAWING.....
For the equilibrium reaction:
Cl2(g) + CO(g) <=> COCl2(g)
How would you go about increasing the concentration of the product, while only changing the volume? Provide a justification in terms of LCP and Collision theory
Increasing pressure --> equilibrium disturbed --> LCP shift to side with less gaseous moles to reduce pressure
--> in terms of collision, increased pressure = increased collision of gaseous moles = increased r.o.r with reactant side dominating due to increase moles of gas = product formation being favoured
0.20 moles of phosphorus pentachloride were heated to 200°C in a 2 L container in the presence of a vanadium catalyst according to the following reaction.
PCl5(g) <--> PCl3(g) + Cl2(g)
At equilibrium, the mixture was found to contain 0.16 moles of chlorine. What is the equilibrium constant for this reaction at this temperature?
0.32
The four letter word beginning with P is widely considered to be the best teacher of chemistry, what is this word
Pain
100 - DEFINE STATIC
100 - DEFINE DYNAMIC
100 - EXAMPLE FOR STATIC
100 - EXAMPLE FOR DYNAMIC
100 - IF YOU ANSWERED ALL OF THAT IN A COHESIVE MANNER
Nitric oxide is reacted with oxygen to form nitrogen dioxide in a closed system to form an equilibrium, at t1, the volume for the system was increased. Draw on the board a concentration-time graph for this.
Whiteboard drawing....
Carbon monoxide and hydrogen gas react to form Keq for Methanol production is 2.4x104 at a set temperature. Enthalpy: -90.7 kJ/mol. Explain how you could you get a reaction quotient value of 4.4x107 changing only concentration.
-Define Q
- How changing the concentration of either products or reactants that would push the Q value up
-Explain with respect to ratio of products over reactants
In chronological order, identify the main topics covered from week 1 to week 5
Wk 1: Static and Dynamic Equilibruim
Wk 2: Collision theory and E.E.G
Wk 3: LCP and Keq
Wk 4: ICE table and Iron thiocyanate prac
Wk 5: Harder ICE table/Q vs K and Ksp