Question

1. Consider the following equilibrium: H₂O_(g) + CO_(g) ⇄ H_2(g) + CO_2(g)

A closed container is initially filled with H₂O and CO. As the reaction proceeds towards equilibrium the

A. [CO] and [CO₂] both increase

B. [ CO] and [CO₂] both decrease

C. [CO] increases and [CO₂] decreases

D. [CO] decreases and [CO₂] increases

2. Consider the following equilibrium: 2SO_3(g) ⇄ 2SO_2(g) + O_2(g)

At equilibrium, the rate of decomposition of SO₃

A. Equals the rate of formation of O₂

B. Equals the rate of formation of SO₃

C. Is less than the rate of formation of O₂

D. Is less than the rate of formation of SO₃

3. Which of the following is true for all equilibrium systems?

A. The mass of reactants is equal to the mass of products

B. Addition of a catalyst changes the equilibrium concentrations

C. The concentration of reactants is equal to the concentration of products

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