Chemical Equilibrium
Chemistry ⇒ Chemical Kinetics and Equilibrium
Chemical Equilibrium starts at 10 and continues till grade 12.
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See sample questions for grade 11
A reaction has Kc = 1.0 × 10-5. Which side is favored at equilibrium?
A reaction mixture contains 0.3 M A, 0.2 M B, and 0.5 M C at equilibrium for the reaction: A + 2B ⇌ C. Write the Kc expression and calculate its value.
Describe what happens to the equilibrium position if a product is removed from a system at equilibrium.
Describe what is meant by a dynamic equilibrium.
Describe what is meant by the term 'reaction quotient' (Q) and how it is used to predict the direction of a reaction.
Explain the difference between homogeneous and heterogeneous equilibrium.
Explain why changing the volume of a container affects the equilibrium position of a gaseous reaction.
Explain why solids and pure liquids are not included in the equilibrium constant expression.
Explain why the equilibrium constant has no units for some reactions but has units for others.
For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what will happen to the equilibrium position if the pressure is increased?
For the reaction: 2A(g) ⇌ B(g) + C(g), if the equilibrium mixture contains 0.2 mol/L of A, 0.1 mol/L of B, and 0.1 mol/L of C, calculate Kc.
For the reaction: 2A(g) ⇌ B(g) + C(g), if the initial concentration of A is 1.0 M and at equilibrium it is 0.6 M, calculate the equilibrium concentrations of B and C.
For the reaction: 2NO2(g) ⇌ N2O4(g), if the volume of the container is halved, what happens to the equilibrium position?
For the reaction: 2NO2(g) ⇌ N2O4(g), Kc = 4.0 at 25°C. If [NO2] = 0.2 M and [N2O4] = 0.1 M, is the system at equilibrium?
For the reaction: A(g) + B(g) ⇌ C(g), the equilibrium concentrations are [A] = 0.5 M, [B] = 0.5 M, and [C] = 1.0 M. Calculate Kc.
For the reaction: CO(g) + 2H2(g) ⇌ CH3OH(g), what will happen to the equilibrium position if the temperature is increased, given that the reaction is exothermic?
If a reaction is exothermic, what will be the effect of increasing temperature on the value of Kc?
If the concentration of a reactant is increased in a system at equilibrium, what will happen to the position of equilibrium?
If the value of Kc is much greater than 1, what does this indicate about the position of equilibrium?
State Le Chatelier's Principle.
