Chemical Equilibrium
Chemistry ⇒ Chemical Kinetics and Equilibrium
Chemical Equilibrium starts at 10 and continues till grade 12.
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A reaction at equilibrium has Kc = 1. What does this indicate about the concentrations of reactants and products?
A reaction has Kc = 0.01. Is the reaction product-favored or reactant-favored at equilibrium?
Describe what happens to the equilibrium position if the pressure is decreased for a reaction where the number of moles of gas is greater on the reactant side.
Describe what happens to the position of equilibrium if the concentration of a reactant is increased.
A reaction mixture at equilibrium contains 0.4 mol/L of D, 0.2 mol/L of E, and 0.1 mol/L of F for the reaction: D ⇌ E + F. Calculate Kc.
A reaction mixture contains 0.2 mol/L of A, 0.3 mol/L of B, and 0.5 mol/L of C at equilibrium for the reaction: A + B ⇌ C. Calculate the equilibrium constant Kc.
For the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g), what will happen to the equilibrium position if the pressure is increased?
For the reaction: H2(g) + I2(g) ⇌ 2HI(g), what will happen to the equilibrium position if more HI is added?
Which of the following changes will shift the equilibrium to the left for an exothermic reaction?
(1) Increase in temperature
(2) Decrease in temperature
(3) Addition of a catalyst
(4) Increase in pressure
Which of the following does NOT affect the value of the equilibrium constant?
(1) Temperature
(2) Pressure
(3) Concentration
(4) Catalyst
Which of the following is a correct equilibrium constant expression for the reaction: 2A(g) ⇌ B(g) + 3C(g)?
(1) Kc = [B][C]3/[A]2
(2) Kc = [A]2/[B][C]3
(3) Kc = [B][C]/[A]2
(4) Kc = [A]/[B][C]3
Which of the following is an example of a heterogeneous equilibrium?
(1) H2(g) + I2(g) ⇌ 2HI(g)
(2) CaCO3(s) ⇌ CaO(s) + CO2(g)
(3) N2(g) + 3H2(g) ⇌ 2NH3(g)
(4) 2SO2(g) + O2(g) ⇌ 2SO3(g)
Fill in the blank: A reaction that can proceed in both forward and reverse directions is called a __________ reaction.
Fill in the blank: According to Le Chatelier’s Principle, if a system at equilibrium is disturbed, the system will shift to __________ the disturbance.
Fill in the blank: If Kc is much greater than 1, the equilibrium mixture contains mostly __________.
Fill in the blank: If the forward reaction is exothermic, increasing the temperature will shift the equilibrium to the __________.
True or False: A catalyst increases the rate at which equilibrium is reached but does not change the position of equilibrium.
True or False: At equilibrium, the concentrations of reactants and products do not change.
True or False: At equilibrium, the forward and reverse reactions stop.
True or False: If a reaction is at equilibrium and more product is removed, the reaction will shift to produce more product.
