Chemistry Practice Problems: Gibbs Free Energy

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22 Questions

What is the characteristic of a system in chemical equilibrium?

The rate of the forward reaction equals the rate of the backward reaction.

What happens to the concentrations of reactants and products in a system at chemical equilibrium?

They remain constant with time.

What is the condition for a system to reach chemical equilibrium?

Any chemical reaction carried out in a closed vessel will reach equilibrium.

What is the characteristic of a reaction that does not go to completion?

The products react to form the original reactants once more.

What is the direction of the reverse reaction in a system at chemical equilibrium?

From products to reactants.

What is the consequence of a system reaching chemical equilibrium?

The concentrations of reactants and products remain constant with time.

What is the primary goal of Le Chatelier's Principle?

To relieve the stress on a system at equilibrium

What is the relationship between ∆G and K at equilibrium?

∆G = -RT ln K

What is the role of the reaction quotient (Q) in the equation ∆G = ∆G° + RT ln Q?

It is the ratio of the concentrations of reactants and products at a given moment in time

What is the unit of the ideal gas constant (R)?

J/K·mol

What is the primary focus of chemical kinetics?

The study of the rate and mechanism of reactions

What is the result of applying a stress to a system at equilibrium?

The equilibrium will shift in a direction to relieve the stress

What is the law of mass action?

The rate of a reaction is proportional to the product of the molar concentrations of the reacting substances

What is the equilibrium constant in terms of concentration?

[C]r[D]s / [A]p[B]q

What happens to the equilibrium constant (K) if the concentration of reactants increases?

K remains the same

What is the effect of increasing the pressure on the equilibrium constant (K) for a reaction involving gases?

K remains the same

What happens to the equilibrium constant (K) if the temperature increases for an endothermic reaction?

K increases

What is the equilibrium constant in terms of partial pressures?

pC pD / pA pB

What happens to the equilibrium constant (K) if a catalyst is added to the reaction?

K remains the same

What is the effect of decreasing the concentration of products on the equilibrium constant (K)?

K remains the same

What is the equilibrium constant (K) for a reaction in which all reactants and products are gases?

pC pD / pA pB

What is the effect of increasing the temperature on the equilibrium constant (K) for an exothermic reaction?

K decreases

Practice problems determining reaction feasibility using Gibbs free energy equations, including calculating ΔG values and evaluating reaction spontaneity.

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