Dynamic Equilibrium and Principle

Question 1

What is the Dynamic Equilibrium?

Answer 1

In an equilibrium system, the rate of the forward reaction is equal to the rate of the reverse reaction, the concentration of the reactants and products do not change.

Question 2

What is the condition for a reaction to remain in equilibrium?

Answer 2

The system must be closed.
Isolated from its surroundings so that the temperature, pressure and concentration of reactants and products are unaffected by outside influences.

Question 3

What is le Chateliers principle?

Answer 3

le Chateliers principle states that when a system in equilibrium is subjected to an external change the system readjusts itself to minimise the effect of that change.

Question 4

What is the effect of concentration changes on equilibrium?

Answer 4

Increase in concentration of A or B OR decrease in concentration of C or D. Shifts to the right
A+B⇌C+D
Increase in concentration of C or D OR decrease in concentration of A or B. Shifts to the left.

Question 5

If there are more products formed , as a result of an equilibrium system adjusting, where does the position of equilibrium shift?

Answer 5

To the right.

Question 6

If there are more reactants formed , as a result of an equilibrium system adjusting, where does the position of equilibrium shift?

Answer 6

To the left.

Question 7

What is the effect of increasing pressure and decreasing pressure on the equilibrium?

Answer 7

Increase pressure shifts towards fewer gaseous molecules and therefore yield of of NO2 decreases
2NO2⇌N2O4
Decreases pressure shifts towards more gaseous molecules and therefore yield of NO2 increases

Question 8

What is the effect of changing the temperature on the equilibrium?

Answer 8

Increase in temp shifts to endothermic side
Decrease in temp shifts to exothermic side.

Question 9

What is the equilibrium constant and what does it show?

Answer 9

Kc=products over reactants
This provides the actual position of equilibrium.

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Question 10

What does the value of Kc tell you?

Answer 10

A Kc value of 1 indicates a position of equilibrium that is halfway between reactants and products.

Kc value >1 indicates a position of equilibrium that is towards the products

Kc value<1 indicates a position of equilibrium that is towards the reactants