Equilibrium Reactions Quiz

This symbol indicates that a reaction is ____________

• reversible

• irreversible

What are the two factors to look for when determining if the reaction is at equilibrium?

• Forward reaction rate is faster than the reverse and concentrations are equal

• Forward and reverse reaction rates are equal and concentration is conctant

• Forward and revers reaction rates are equal and concentration is equal

• Forward reaction rate is faster than the reverse and concentration is equal

At elevated temperatures ammonium carbonate, NH2COONH4, is in equilibrium with NH3 and CO2 according to the equation; NH2COONH4(s) ↔ 2 NH3(g) + CO2(g) What is the equilibrium expression for this reaction?

• K = [NH3]2[CO2]/[NH2COONH

• K = 2 [NH3][CO2]/[NH2COONH4]

• [NH2COONH4]/[NH2COONH4]

• K = 2 [NH3][CO2]/[NH2COONH]4

When 0.40 mole of SO2 and 0.60 mole of O2 are placed in an evacuated 1.00-liter flask, the reaction represented below occurs. 2SO2 (g) + O2 (g) ↔ 2SO3 (g) After the reactants and the product reach equilibrium and the initial temperature is restored, the flask is found to contain 0.30 mole of SO3. Based on these results, the equilibrium constant, Kc, for the reaction is

• 20

• 10

• 6.7

• 2.0

What are [A] and [B]?

• concentration of reactants

• concentration of products

• energy of reactants

• energy of products

A mixture of hydrogen and nitrogen in a reaction vessel is

allowed to attain equilibrium at 472 °C. The equilibrium mixture

of gases was analyzed and found to contain 7.38 atm H2, 2.46

atm N2 and 0.166 atm NH3. From these data, calculate the

equilibrium constant Kp for the reaction:

• 2.80 x 10^-5
• 5.67 x 10^-2
• 1.50 x 10^-3
• 3.14 x 10^-1

An aqueous solution of acetic acid is found to have the following

concentrations at 25 °C: [CH3COOH] = 1.65 × 10–2 M; [H3O+] =

5.44 × 10–4 M; and [CH3COO–] = 5.44 × 10–4 M. Calculate the

equilibrium constant Kc for the ionization of acetic acid at 25 °C.

The reaction is:

• 1.00 × 10–5
• 2.50 × 10–7
• 1.79 × 10–5

• 3.00 × 10–6