Keq Review (LTA C1)

Front

What is the equilibrium constant (K_eq)?

Back

The equilibrium constant (K_eq) is a numerical value that expresses the ratio of the concentrations of products to the concentrations of reactants at equilibrium for a reversible chemical reaction.

Front

What does a large K_eq value indicate about a reaction?

Back

A large K_eq value (e.g., K_eq = 1000) indicates that at equilibrium, the reaction favors the formation of products, meaning there are mostly products present.

Front

What is the equilibrium-constant expression for the reaction: CO2(g) + H2(g) ↔ CO(g) + H2O(l)?

Back

K_c = [CO] / [CO2][H2]

Front

How do you calculate the equilibrium constant (K_eq) from concentrations?

Back

K_eq is calculated using the formula: K_eq = [products]^[coefficients] / [reactants]^[coefficients], where concentrations are raised to the power of their coefficients in the balanced equation.

Front

What does a small K_eq value indicate about a reaction?

Back

A small K_eq value (e.g., K_eq < 1) indicates that at equilibrium, the reaction favors the reactants, meaning there are mostly reactants present.

Front

In the reaction SO2(g) + NO2(g) ↔ SO3(g) + NO(g), what are the equilibrium concentrations given: [SO3] = 0.40 M, [NO] = 0.30 M, [NO2] = 0.15 M, [SO2] = 0.20 M?

Back

K_eq = (0.40)(0.30) / (0.20)(0.15) = 4.0

Front

What is the significance of the equilibrium constant in chemical reactions?

Back

The equilibrium constant provides insight into the extent of a reaction and helps predict the concentrations of reactants and products at equilibrium.

Front

What is the relationship between K_c and K_p?

Back

K_c is the equilibrium constant expressed in terms of molarity (concentration), while K_p is expressed in terms of partial pressures. They are related by the equation K_p = K_c(RT)^(Δn), where Δn is the change in moles of gas.

Front

What does it mean if a reaction is at equilibrium?

Back

A reaction is at equilibrium when the rates of the forward and reverse reactions are equal, resulting in constant concentrations of reactants and products over time.

Front

How does temperature affect the equilibrium constant?

Back

The equilibrium constant (K_eq) is temperature-dependent; changing the temperature can shift the position of equilibrium and alter the value of K_eq.