CART Equilibrium and Reaction Rates 3

Question 1

Le Chatelier's Principle predicts that for an exothermic reaction at equilibrium, increasing temperature will:

Accepted Answer

Shift equilibrium toward reactants

Answer

Shift equilibrium toward products

Answer

Have no effect on equilibrium

Answer

Increase Kc

Question 2

The reaction quotient Q is used to:

Accepted Answer

Predict which direction a reaction will proceed to reach equilibrium

Answer

Measure the activation energy of a reaction

Answer

Calculate the rate constant k

Answer

Determine the heat of reaction

Question 3

Which statement about a catalyst is correct?

Accepted Answer

It provides an alternate pathway with lower activation energy

Answer

It is consumed during the reaction

Answer

It increases the activation energy

Answer

It changes the equilibrium constant

Question 4

For the equilibrium N₂O₄(g) ⇌ 2NO₂(g), adding more N₂O₄ will:

Accepted Answer

Shift equilibrium to the right to produce more NO₂

Answer

Decrease the value of Kc

Answer

Increase the value of Kc

Answer

Shift equilibrium to the left

Question 5

A reaction has Kc = 1.0 × 10⁻⁸. This very small value indicates that at equilibrium:

Accepted Answer

Reactants are highly favored

Answer

Products are highly favored

Answer

Concentrations are equal

Answer

The reaction is very fast

Question 6

Which graph best represents the concentration changes of reactants and products as a reversible reaction reaches equilibrium?

Accepted Answer

Both concentrations level off and remain constant after equilibrium is reached

Answer

Both reactant and product concentrations continue to change indefinitely

Answer

Reactant concentration drops to zero while product concentration rises to maximum

Answer

Product concentration decreases after equilibrium is reached