Chemical Equilibrium Quiz

What is meant by chemical equilibrium?

• A state where reactants are completely consumed

• A state where the reaction stops completely

• A state in a chemical reaction where the forward and reverse reactions occur at the same rate, resulting in no net change in the concentrations of reactants and products.

• A state where products are not formed

State Le Chatelier's Principle.

• Le Chatelier's Principle states that a system at equilibrium will always remain unchanged regardless of external factors.

• Le Chatelier's Principle states that adding more reactants to a system at equilibrium will not affect the equilibrium position.

• Le Chatelier's Principle states that increasing the temperature of a system at equilibrium will cause the system to shift towards the side with lower temperature.

• Le Chatelier's Principle states that if a system at equilibrium is subjected to a change in temperature, pressure, or concentration of reactants/products, the system will shift its position to counteract the imposed change and restore a new equilibrium.

Explain the difference between dynamic and static equilibrium.

• Dynamic equilibrium involves ongoing reactions with a significant net change in concentrations.

• Dynamic equilibrium involves ongoing reactions with no net change in concentrations, while static equilibrium involves reactions that have completely stopped.

• Static equilibrium involves ongoing reactions with no net change in concentrations.

• Dynamic equilibrium involves reactions that have completely stopped.

How does temperature affect the position of equilibrium?

• Temperature affects the position of equilibrium by favoring the reaction that absorbs or releases heat.

• Decreasing temperature always shifts the equilibrium to the right

• Increasing temperature always shifts the equilibrium to the left

• Temperature has no effect on the position of equilibrium

Define the equilibrium constant, Kc.

• Kc is the ratio of the concentrations of products to reactants at equilibrium, each raised to the power of their respective stoichiometric coefficients.

• Kc is the temperature at which a reaction reaches equilibrium.

• Kc is the rate constant for a reaction.

• Kc is the total concentration of reactants in a reaction.

What is the significance of reaction quotient, Q?

• The significance of reaction quotient, Q, lies in its ability to predict the direction a reaction will proceed towards equilibrium based on the concentrations of reactants and products.

• The value of Q is constant throughout a reaction

• Reaction quotient, Q, is used to determine the rate of a reaction

• Q represents the total energy change in a reaction

Discuss the effect of pressure on equilibrium.

• Increasing pressure will favor the side of the reaction with more moles of gas.

• Pressure has no effect on equilibrium.

• Decreasing pressure will shift the equilibrium towards the side with more moles of gas.

• Increasing pressure will favor the side of the reaction with fewer moles of gas.

Describe the concept of equilibrium constant expression.

• The equilibrium constant expression represents the ratio of product concentrations to reactant concentrations at equilibrium in a chemical reaction.

• The equilibrium constant expression is used to calculate the rate of a reaction

• The equilibrium constant expression is not affected by changes in temperature

• Equilibrium constant expression is only applicable to exothermic reactions

What are the factors that can affect the equilibrium position?

• Surface area, mass, shape

• Volume, time, color

• Density, viscosity, solubility

• Temperature, pressure, concentration, catalyst

Provide an example of a reversible reaction in daily life.

• Burning wood

• Freezing water

• Cooking an egg

• Water evaporating and condensing