1.6 Chemical Equilibria

Question 1

Key features of a dynamic equilibrium

Answer 1

1. Rate of forwards reaction = rate of backwards reaction
2. Concentration of reactants and products is constant

Question 2

If an equilibrium lies to the left, what has a higher concentration at equilibrium?

Reactants OR products

Answer 2

Reactants

Question 3

If an equilibrium lies to the right, what has a higher concentration at equilibrium?

Reactants OR products

Answer 3

Products

Question 4

Le Chatelier’s Principle

Answer 4

If a closed system in dynamic equilibrium is subjected to a change, the position of equilibrium will move in the direction that opposes that change

Question 5

Conditions for the Haber process

Answer 5

• 200atm
• 400-450°C
• Iron catalyst

Question 6

Kc

Answer 6

• Equilibrium constant (in terms of concentrations)
• Shows the composition of a mixture at equilibrium

Question 7

Kc equation

Answer 7

Kc = ([P1]ᵖ¹[P2]ᵖ²) / ([R1]ʳ¹[R2]ʳ²)

[R] - reactant conc
[P] - product conc
r and p - stoichiometric coefficients

Question 8

What variable can alter Kc?

Answer 8

Temperature

Question 9

Concentrations if: Kc &laquo_space;1

Answer 9

[Reactants] > [Products]
(Equilibrium to the left)

Question 10

Concentrations if: Kc&raquo_space; 1

Answer 10

[Products] > [Reactants]
(Equilibrium to the right)