ch15

Kc vs Kp

Kc is the equilibrium constant for concentration, while Kp is for partial pressures; they relate through the ideal gas equation.

What does a very small equilibrium constant indicate?

That the equilibrium mixture contains mostly reactants.

What happens when k is greater than 1?

Equilibrium lies to the right, and products dominate.

What happens when k is less than 1?

Equilibrium lies to the left, and reactants dominate.

What is the relationship between the equilibrium constants of a reaction in the forward and reverse direction?

The equilibrium constant of the reverse reaction is the inverse (or reciprocal) of the forward reaction's constant.

How does multiplying a reaction affect its equilibrium constant?

The equilibrium constant is raised to a power equal to the number of times the reaction is multiplied.

What is excluded from the equilibrium constant expression in a heterogeneous equilibrium?

The concentration of pure solids or pure liquids.

What is the reaction quotient, Q?

A number obtained by substituting concentrations or partial pressures of reactants and products into the equilibrium-constant expression.

What does Q < K indicate?

The reaction proceeds from left to right to form more products.

What does Q = K indicate?

The system is at equilibrium.

What does Q > K indicate?

The reaction proceeds from right to left to form more reactants.

What does Le Châtelier’s Principle state?

If a system at equilibrium is disturbed, it will shift its equilibrium position to counteract the disturbance.

How does reducing the volume of a gaseous equilibrium mixture affect the system?

It shifts the system in the direction that reduces the number of moles of gas.

In an endothermic reaction, how is heat treated?

As a reactant.

In an exothermic reaction, how is heat treated?

As a product.

In an endothermic reaction, what does increasing temp do to k?

higher k value

In an exothermic reaction, what does increasing temp do to k?

lower k value

Why ar kf and kt not the same in equilibrium?

Kf and Kt are not the same in equilibrium because Kf is the formation constant, which measures how favorably reactants form products, while Kt is the reverse reaction constant, which measures how easily products break back into reactants.

Whats the haber process?

Processed used for the synthesis of ammoniafrom nitrogen and hydrogen gases under high temperature and pressure, using an iron catalyst.