SAT/Pre AP: Chemical Equilibrium Quiz

Which of the following is a property of a system at equilibrium?

• The concentrations of reactants and products are equal.

• The rate of the forward reaction is zero.

• The rate of the forward reaction is equal to the rate of the reverse reaction.

• The rate of the reverse reaction is a maximum.

• The rate of of the forward reaction is a minimum

Tags

NGSS.HS-PS1-6

Consider the reaction:

CO₂(g) + 4H₂(g) = CH₄(g) + 2H₂O(g)

• 
• 
• 
• 
• none of the above

In which system will decreasing the pressure increase the equilibrium concentration of the species in bold?

• 
• 
• 
• 
• none of the above

What is the effect of increasing the temperature on the position of equilibrium and the value of the equilibrium constant for the reaction:

Position of equilibrium Value of equilibrium constant

• shifts to the left decreases

• shifts to the right decreases

• shifts to the right increases

• shifts to left increases

• unchanged unchanged

Consider the system:

What is the effect of introducing a catalyst?

• The rate of the forward reaction increases but the rate of the reverse reaction remains the same.

• The position of equilibrium is shifted to the right.

• The time taken to reach equilibrium is decreased.

• The value of the equilibrium constant is reduced.

• The Ea remains unchanged

Which of the following changes will increase the equilibrium yield of ammonia according to the following equation?

• decreasing the temperature from 200 °C to 100 °C

• introducing a catalyst

• decreasing the pressure from 200atm to 100atm

• increasing the temperature from 100°C to 200°C

• none of the above.

The equilibrium concentrations at a certain temperature for the reaction

• 0.025

• 2

• 10

• 40

• 4

Consider the equilibrium:

0.20mol Z are placed in a sealed 10dm³ container and allowed to come to equilibrium at 500K.At equilibrium, 0.040mol X were present in the reaction vessel.The value of the equilibrium constant at this temperature is:

• 5

• 9

• 16

• 25

• 36

Which takes place when a catalyst is added

to a reaction at equilibrium?

• The point of equilibrium is shifted to the right.

• The point of equilibrium is shifted to

  the left.

• The forward and reverse reactions rates are increased unequally.

• The forward and reverse reactions rates are increased equally.

• The value of ∆H has the same magnitude but a different sign.

Which factors are equal in a reversible chemical reaction that has reached equilibrium?

• The number of moles of the reactants and products.

• The potential energies of the reactants and products.

• The activation energies of the forward and reverse reactions.

• The rates of reaction for the forward and reverse reactions.

• The concentrations of the reactants and products.