Chemical Equillibria And Kc

Question 1

How is the dynamic equilibrium reached?

Answer 1

At the start of reaction, the forward reaction is fast and the backward reaction is slow. after the start of the reaction, the forward reaction slows down and the backwards reaction speeds up. the rate of the forward reaction is equal to the rate of the backward reaction.

Question 2

Dynamic meaning, equilibrium meaning

Answer 2

Dynamic- the rate of the forward reaction is equal to the backwards reaction
Equilibrium- The concentrations of reactants and products are constant

Question 3

Le Chatelier’s principle

Answer 3

The position of the equilibrium will shift to oppose a change made to it.

Question 4

Concentration CO + H20– CO2 +H2

Answer 4

If concentration of CO increases- equilibrium will shift to the right to oppose increase. the yield of CO2 and H2 will increase
If concentration of Co decreases the equilibrium will shift to the left to oppose reduction in CO. the yield of CO and H20 will increase

Question 5

pressure 2NO2–N2O4

Answer 5

If pressure increased- fewer moles on the right. equilibrium will shift to the right to oppose increase in pressure
If pressure decreased- more moles on the left so shifts to the left to oppose decrease in pressure.

Question 6

Volume

Answer 6

Increase in volume decreases the pressure=- a decrease in volume increases the pressure

Question 7

Temperature

Answer 7

For an exothermic reaction:
If temperature decreased- the forward reaction is exothermic. The equilibrium will shift to the right to oppose decrease in temp
If temp increased- the backward reaction is endothermic, the equilibrium will shift to the left to oppose increase in temp.

Question 8

When a catalyst is added to a reversible reaction

Answer 8

The rate of the forward and reverse reaction increase equally. No change in equilibrium, dynamic equilibrium is reached faster.

Question 9

Haber process

Answer 9

400atm, temp 350

Question 10

If

Answer 10

If Kc greater than 1, then there are more products then reactants at equilibrium and the eq is shifted to the right. If kc is less than one, then there are more reactants than products and eq has shifted to the left. If exactly 1, concentration of products is equal to concentration of reactants.
Only temperature changes the Kc value.