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Definitions
Le Chatelier's Principle
Le Chatelier's Principle
Equilibrium Expressions
100
When the forward and reverse reactions are proceeding at the same rate
What is equilibrium?
100
This stress only affects equilibrium reactions with at least one gas
What is pressure changes?
100

For the reaction:

H2(g) + I2 (g) + heat <---> 2HI(g)

State the effect on the concentration of iodine gas when hydrogen gas is added to this equilibrium system. 

The concentration will decrease

100

The equilibrium expression for the reaction

NH3(g) + O2(g) → NO(g) + H2O(g)

What is Kc= [NO][H2O]/[NH3][O2]?

200

A still sealed soda can is classified as a type of system.

What is closed equilibrium?

200
This is the only stress that can change the Kc value
What is temperature?
200

Given the equation representing a chemical system at equilibrium in a sealed, rigid container:

H2(g) + I2(g) + energy <----> 2HI(g)

When the temperature of the system in the container is increased, the equilibrium shifts to the

Shift to the right

200

The equilibrium expression for the reaction

H2(g) + I2 (g) + heat <---> 2HI(g)

What is Kc= [HI]2/[H2][I2]

300

These need to be kept constant to MAINTAIN equilibrium

What is temperature, pressure or concentration?

300
This addition of this will speed up BOTH the rate of the forward AND reverse reactions.
What is a catalyst?
300

For the following reaction:

CaCO3(s) + 177.8 kJ <----> CaO(s) + CO2(g)

What shift would occur if the temperature was decreased 

Shift to the left

300

What is the equilibrium expression for the following reaction:

N2(g) + 3 H2(g) <------> 2 NH3(g) + energy 

Kc=[NH3]2/[N2][H2]3

400

The only type of solution that can be in equilibrium

What is saturated solutions?

400

Fe3+ + SCN- <------> FeSCN2+ If I added Fe3+ to the system the reaction would shift to the

What is right?

400

For the following reaction:

CH4(g) + H2O(g) + 210 kJ <----> CO(g) + 3H2(g)

What will the shift be if the pressure of the system is increased

Shift to the left

400

What is the equilibrium expression for the following reaction:

2 NOCl(g) < -----> 2 NO(g) + Cl2(g) 

What is Kc = [NO]2[Cl2]2/[NOCl]2

500

An increase in pressure will favor the side with the ________amount of moles

What is least?

500

N2O4 + 58.0 kJ <---> 2NO2 In order to shift to the right the temperature would need to...

What is increase?

500
Suggest three ways to increase concentration of SO3 in this reaction: 2SO2 +O2 <-----> 2SO3
What is : 1. remove SO3 2. increase either SO2 or O2 3. increase pressure (decrease volume)
500

What is the equilibrium expression for the following reaction:

CO32-(aq) + H2O(s) <-----> HCO3-(aq) + OH-(aq)

What is Kc= [OH-][HCO3-]/[CO32-]