equilibria - p1,2,3

Question 1

What is an Equilibrium mixture

Answer 1

Where the proportions of all components in a mixture remain constant

Question 2

Dynamic equilibrium

Answer 2

Where the forwards and backwards reaction occur at the same rate

Question 3

What is Le chatelier’s principle

Answer 3

f a system at equilibrium is disturbed, the equilibrium moves in the direction to reduce the disturbance

Question 4

Changing concentration in equilibrium

Answer 4

Increasing the concentration of REACTANTS or decreasing concentration of PRODUCTS causes a shift to the RIGHT (forward)

Increasing concentration of the PRODUCTS or decreasing concentration of REACTANTS causes a shift to the LEFT (Backwards)

Question 5

What information shows if a reaction is exothermic or endothermic?

Answer 5

Reactions at equilibrium are shown with a value for H for the forward direction
- H indicates forward reaction is exothermic (and therefore reverse is endothermic)
+ H icates forward reaction is endothermic (and therefore reverse is exothermic)

Question 6

What happens to the position of an equilibrium if pressure is increased?

Answer 6

The equilibrium shifts to the side of the reaction with less number of gaseous moles

Question 7

What happens to the position of an equilibrium if temperature is increased?

Answer 7

The equilibrium shift to the endothermic direction to reduce temperature

Question 8

what happens to the position of an equilibrium if the concentration of a reactant is increased?

Answer 8

The equilibrium shifts to the products to remove the added reactants

Question 9

How does the addition of a catalyst affect a reaction at
equilibrium?

Answer 9

Does not affect the position of equilibrium, but speeds up the rate at which equilibrium is achieved

Question 10

Why does a catalyst not impact the yield?

Answer 10

increases the rate of forwards and reverse reactions equally

Question 11

What factor affects the value of Kc ?

Answer 11

temp only