equilibria

Question 1

2 features of Dynamic equilibrium

6.1 Chemical equilibria and Le Chatelier’s principle

Answer 1

• The rate of the forward reaction is the same as the rate of the backward reaction
• concentrations remain constant

Question 2

Le Chatelier’s principle

6.1 Chemical equilibria and Le Chatelier’s principle

Answer 2

If a system at equilibrium is disturbed, the equilibrium moves in the direction that tends to reduce the disturbance

Question 3

Chemical feedstock

6.1 Chemical equilibria and Le Chatelier’s principle

Answer 3

The starting materials in an industrial chemical process

Question 4

2A(aq) + B(aq) = C(aq) + D(aq)

effect of increasing pressure

6.1 Chemical equilibria and Le Chatelier’s principle

Answer 4

• the reaction will shift to oppose the change by favoring the side with fewer molecules
• in this case will favour forwards

Question 5

2A(aq) + B(aq) = C(aq) + D(aq)

effect of increasing concentration

6.1 Chemical equilibria and Le Chatelier’s principle

Answer 5

• if morec reactant is added the equilibrium will shift to counteract - making more product

Question 6

2A(aq) + B(aq) = C(aq) + D(aq)

effect of increasing temprature

6.1 Chemical equilibria and Le Chatelier’s principle

Answer 6

• increasing temp will shift to favour the endothermic reaction

Question 7

equilibrium constant (Kc)

6.2 Equilibrium constant Kc

Answer 7

indicates the position of equilibrium for a reaction at a certain temperature

Question 8

factors that effect Kc

6.2 Equilibrium constant Kc

Answer 8

only temprature - as the equilibrium position change results in different concentrations of reactants and products.

Question 9

how to calculate amount,in mols, of a substance in an equilibrium mixture

3 steps

6.2 Equilibrium constant Kc

Answer 9

I - initial
C - change
E - equilibrium

Question 10

how to calculate partial pressure

2 steps

Answer 10

mol fraction=equilibrium/total mol

Pp= mol fractrion x total pressure (KPa)