Factors affecting chemical equilibrium

Which of the following factors does NOT affect the position of equilibrium of a reversible reaction?

• Temperature

• Concentration

• Catalyst

• Pressure

According to Le Chatelier's principle, if the concentration of reactants is increased, the equilibrium will shift towards:

• The reactants

• The products

• No change

• Cannot be determined

An increase in temperature favors an endothermic reaction. Which of the following is true?

• The equilibrium constant increases.

• The equilibrium constant decreases.

• The equilibrium constant remains unchanged.

• Cannot be determined.

A catalyst speeds up both the forward and reverse reactions equally. How does it affect the equilibrium position?

• Shifts to the right

• Shifts to the left

• No effect

• Cannot be determined

The equilibrium constant (Kc) for a reaction is 10^4. This indicates that the reaction:

For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), increasing the pressure will:

• Shift the equilibrium to the left

• Shift the equilibrium to the right

• Have no effect on the equilibrium

• Increase the value of Kc

The equilibrium expression for the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g) is:

• Kc = [SO3]^2 / [SO2]^2[O2]

• Kc = [SO2]^2[O2] / [SO3]^2

• Kc = [SO3] / [SO2][O2]

• Kc = [SO2][O2] / [SO3]

A system at equilibrium is said to be in a state of:

• Dynamic equilibrium

• Static equilibrium

• No equilibrium

• Unpredictable state

If the value of Kc for a reaction is very small, it indicates that:

Which of the following is NOT a factor affecting the rate of a reaction?

• Concentration of reactants

• Temperature

• Pressure

• Catalyst