Equilibrium Constants and Expressions

This video introduces equilibrium constant expressions for reversible reactions, explaining the law of mass action and how to write these expressions. It covers both homogeneous and heterogeneous equilibria, including examples like hydrogen iodide formation and the Haber process. The video also discusses solubility product expressions, emphasizing the role of sparingly soluble salts. It concludes with a call to action for viewers to engage with the content.

What does the law of mass action state about the rate of a chemical reaction?

• It is inversely proportional to the product of the reactant concentrations.

• It is independent of the reactant concentrations.

• It is directly proportional to the product of the reactant concentrations.

• It is inversely proportional to the temperature.

In the equilibrium constant expression for a reaction, what do the exponents represent?

• The temperature of the reaction.

• The coefficients from the balanced chemical equation.

• The pressure of the reactants.

• The volume of the reaction vessel.

For the reaction between hydrogen and iodine forming hydrogen iodide, what is the equilibrium constant expression?

• [H2][I2]/[HI]^2

• [HI]^2/[H2][I2]

• [HI]/[H2][I2]^2

• [H2][I2]^2/[HI]

What is the equilibrium constant expression for the formation of ammonia from nitrogen and hydrogen?

• [N2][H2]/[NH3]^2

• [NH3]/[N2][H2]

• [N2][H2]^3/[NH3]^2

• [NH3]^2/[N2][H2]^3

In a heterogeneous equilibrium involving calcium carbonate decomposition, what is the key macroscopic property measured?

• Volume of the container.

• Pressure of carbon dioxide.

• Concentration of calcium oxide.

• Temperature of the system.

What is the equilibrium constant expression for the decomposition of PCl5?

• [Cl2]/[PCl3][PCl5]

• [PCl3][Cl2]/[PCl5]

• [PCl5]/[PCl3][Cl2]

• [PCl3]^2/[Cl2][PCl5]

In a heterogeneous equilibrium, why do solids not affect the equilibrium expression?

• Their concentration is constant.

• They react too slowly.

• They have no mass.

• They are not involved in the reaction.

What does KSP stand for in the context of solubility product expressions?

• Solubility Product Constant

• Kinetic Solubility Product

• Partial Solubility Product

• Equilibrium Solubility Product

For the precipitation of barium sulfate, what is the KSP expression?

• 1/[Ba2+][SO42-]

• [Ba2+][SO42-]

• [Ba2+]/[SO42-]

• [SO42-]/[Ba2+]

In the context of solubility product, what does it mean if a compound is described as 'sparingly soluble'?

• It reacts with water.

• It dissolves to a small extent.

• It dissolves in large amounts.

• It is completely insoluble.