Pre lesson: Equilibrium

Which of the following statements is CORRECT for a reaction at an equilibrium?

• Forward and backward reaction have different rate of reaction

• The forward and reverse reactions will stop.

• The concentrations of product and reactant are equal.

• The concentrations of both product and reactant are remaining constant

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

• reversible

• balance

• equilibrium

• constant

What type of equilibria involved for the reaction below:
SOCl₂(g)  +  H₂O(g)   ⇌    SO₂(g)  +  2HCl(g)

• Homogeneous equilibria where all reactants and products are in same phase

• Homogeneous equilibria where all reactants and products are in different phase

• Heterogeneous equilibria where all reactants and products are in same phase

• Heterogeneous equilibria where all reactants and products are in different phase

complete this equilibrium graphic below when ammonia is produced from nitrogen and hydrogen gaseous

a

c

d

e

3N₂

2N₂

2N₂ + 3H₂ ---> 2NH₃

3H₃

2NH₃

The formula to calculate Equilibrium constant is written below.

Kc = [product]/ [ reactant]

• true

• false

For the graph that shown reaction of NO₂ production from N₂O₄, choose the CORRECT statement.

• At start of reaction, only NO₂ was present.

• The systems never reach equilibrium

• At equilibrium, more NO₂ is present than N₂O₄.

• All of N₂O₄ used up on this reaction

Factors/ stresses that affect the equilibrium position, EXCEPT ......

• concentration

• temperature

• catalyst

• pressure

2SO₂(g)+O₂(g)⇌2SO₃(g)

By adding the concentration of SO₂ what will happen?

• shift equilibrium right

• shift equilibrium left

• [SO₂] increasing

• increase rate of reaction

Changes in pressure will only affect substances that are in the __________ state

• solid

• liquid

• gaseous

• aqueous

For the reaction...
calor +  N₂  +  O₂  ↔  2NO
If the temperature is increased, the equilibrium will shift _______.and _______

• left and [NO] decreasing

• right and [NO] decreasing

• right and [NO] increasing

• right and [NO] increasing