Law of Mass Action in Chemistry
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Questions and Answers

What is the law of mass action used to describe?

  • The rate of a chemical reaction
  • The rate of a physical change
  • The mole ratio of reactants
  • The equilibrium of a chemical reaction (correct)
  • What is the mathematical expression of the law of mass action?

  • K = [Products] / [Reactants] (correct)
  • K = [Reactants] / [Products]
  • [Reactants] / [Products]
  • [Products] / [Reactants]
  • What does the equilibrium constant (K) represent in the law of mass action?

  • The ratio of reactants to products
  • The rate of the reaction
  • The concentration of reactants
  • The ratio of products to reactants at equilibrium (correct)
  • What is the significance of the equilibrium constant (K) being greater than 1?

    <p>The reaction favors the products</p> Signup and view all the answers

    What is the effect of increasing the concentration of reactants on the equilibrium of a reaction?

    <p>The equilibrium shifts to the right</p> Signup and view all the answers

    Study Notes

    Law of Mass Action

    • The law of mass action is used to describe the equilibrium of a reversible reaction, where the rates of forward and reverse reactions are equal.

    Mathematical Expression

    • The mathematical expression of the law of mass action is: K = [C]^c [D]^d / [A]^a [B]^b, where K is the equilibrium constant, and [A], [B], [C], and [D] are the concentrations of reactants and products, respectively.

    Equilibrium Constant (K)

    • The equilibrium constant (K) represents the ratio of the product of the concentrations of the products to the product of the concentrations of the reactants, at equilibrium.

    Significance of K > 1

    • When K is greater than 1, the equilibrium favors the formation of products, meaning that the reaction tends to proceed towards the products side.

    Effect of Concentration on Equilibrium

    • Increasing the concentration of reactants shifts the equilibrium to the right, favoring the formation of products, as the system attempts to reduce the concentration of reactants by forming more products.

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    Description

    This quiz covers the law of mass action, its mathematical expression, and the significance of the equilibrium constant (K) in chemical reactions.

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