Chemical Equilibrium Quiz

Which statement best describes chemical equilibrium?

It is a state in a reversible reaction where the rate of the forward reaction equals the rate of the reverse reaction. (correct)
It is a state where the reaction has stopped completely.
It is a state where the reaction rate is extremely slow.
It is a state where all reactants have been converted into products.

What is the Law of Mass Action?

It states that the rate of a chemical reaction is constant.
It states that the rate of a chemical reaction is unaffected by the concentration of the reactants.
It states that the rate of a chemical reaction is inversely proportional to the concentration of the products.
It states that the rate of a chemical reaction is directly proportional to the concentration of the reactants. (correct)

What is the equilibrium constant expression of a reaction?

The product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients. (correct)
The ratio of the concentrations of the products to the concentrations of the reactants.
The sum of the concentrations of the products divided by the sum of the concentrations of the reactants.
The difference between the concentrations of the products and the concentrations of the reactants.

What are the macroscopic characteristics of the forward reaction in chemical equilibrium?

The concentration of the products increases over time. (A) Signup and view all the answers

Under what conditions can equilibrium be recognized?

When the rate of the forward reaction equals the rate of the reverse reaction. (C) Signup and view all the answers

What is chemical equilibrium in terms of a reversible reaction?

Chemical equilibrium in terms of a reversible reaction is when the rates of the forward and reverse reactions are equal, and the concentrations of the reactants and products remain constant over time. Signup and view all the answers

How can the equilibrium constant expression of a reaction be derived?

The equilibrium constant expression of a reaction can be derived by using the Law of Mass Action and expressing the ratio of the products' concentrations to the reactants' concentrations at equilibrium. Signup and view all the answers

What are the necessary conditions for chemical equilibrium?

The necessary conditions for chemical equilibrium are closed system, constant temperature, and sufficient time for the forward and reverse reactions to reach the same rate. Signup and view all the answers

How can equilibrium be recognized in a chemical reaction?

Equilibrium in a chemical reaction can be recognized by the constancy of the concentrations of the reactants and products over time. Signup and view all the answers

What is the macroscopic characteristic of the reverse reaction in chemical equilibrium?

The macroscopic characteristic of the reverse reaction in chemical equilibrium is the formation of reactants from products as the reverse reaction occurs concurrently with the forward reaction. Signup and view all the answers

Explain the concept of chemical equilibrium in terms of a reversible reaction.

Chemical equilibrium is the state in a reversible reaction where the rate of the forward reaction is equal to the rate of the reverse reaction, and the concentrations of the reactants and products remain constant over time. Signup and view all the answers

Derive the expression for the equilibrium constant and its units.

The equilibrium constant (Kc) expression for a reaction is derived by taking the product of the concentrations of the products raised to the power of their coefficients, divided by the product of the concentrations of the reactants raised to the power of their coefficients. The units of Kc depend on the specific reaction and the concentrations used. Signup and view all the answers

State the necessary condition for chemical equilibrium and how it can be recognized.

The necessary condition for chemical equilibrium is that the rates of the forward and reverse reactions are equal. Equilibrium can be recognized by observing that the concentrations of the reactants and products remain constant over time. Signup and view all the answers

Describe the macroscopic characteristics of both the forward and reverse reactions in chemical equilibrium.

In chemical equilibrium, the macroscopic characteristic of the forward reaction is that it appears to have stopped, while the macroscopic characteristic of the reverse reaction is that it also appears to have stopped. However, at the microscopic level, both reactions continue at equal rates. Signup and view all the answers

Explain why most chemical reactions do not proceed to completion.

Most chemical reactions do not go to completion because the products can react themselves to form the reactants, leading to a dynamic state where the forward and reverse reactions continue simultaneously. Signup and view all the answers