Equilibrium Constants and Reactions

Professor Dave explains chemical equilibria, focusing on reversible reactions and dynamic equilibrium. He introduces the ICE box method for calculating equilibrium concentrations and discusses equilibrium constant expressions. The tutorial includes examples and a comprehension check to reinforce learning.

What is the term used to describe a system where the forward and reverse reactions occur at the same rate?

• Static equilibrium

• Dynamic equilibrium

• Chemical stasis

• Reaction balance

In a reversible reaction, what happens to the reactants and products at equilibrium?

• The concentrations of reactants and products remain constant

• The reaction stops completely

• Reactants are completely converted to products

• Products are completely converted to reactants

What does the 'C' in the ICE box method stand for?

• Change

• Constant

• Coefficient

• Concentration

How is the equilibrium constant (Kc) expression structured?

• Reactants over products, each raised to their stoichiometric coefficients

• Difference between products and reactants

• Products over reactants, each raised to their stoichiometric coefficients

• Sum of products and reactants

What does a Kc value much greater than one indicate?

• The reaction is not occurring

• More products are present

• The reaction is at equilibrium

• More reactants are present

Which species are not included in the equilibrium constant expression?

• Aqueous species

• Gases

• Solids and pure liquids

• All species are included

What is the reaction quotient (Q) used for?

• Measuring the temperature of a reaction

• Calculating equilibrium concentrations

• Predicting the direction of a reaction

• Determining the rate of reaction

If Kc is smaller than Q, what will the reaction do to reach equilibrium?

• Stop completely

• Produce more reactants

• Produce more products

• Remain unchanged

In an ICE box calculation, what does a negative change in concentration indicate?

• Decrease in pressure

• Increase in temperature

• Depletion of reactants

• Formation of products

What mathematical method might be needed if the equilibrium expression is not easily simplified?

• Linear equation

• Quadratic equation

• Logarithmic equation

• Exponential equation