Equilibrium Constants in Chemical Reactions

The video tutorial explains the concept of the equilibrium constant, represented as KQ, KC, or KP, and how it is calculated using the equilibrium expression. The equilibrium constant is a unique, unitless value for each chemical reaction, indicating when equilibrium is established. It is temperature-dependent and excludes solids and liquids from the expression. The video provides examples of writing equilibrium expressions and balanced chemical equations, emphasizing the importance of coefficients and the exclusion of non-gaseous species.

What does the equilibrium constant represent in a chemical reaction?

• The temperature at which the reaction occurs

• The speed of the reaction

• The ratio of product to reactant concentrations at equilibrium

• The amount of energy released

Which of the following is NOT a common representation of the equilibrium constant?

• KQ

• KC

• KP

• KT

Why is the equilibrium constant considered unitless?

• Because it is measured in moles

• Because it depends on the reaction speed

• Because it is a ratio of concentrations

• Because it is always zero

How does temperature affect the equilibrium constant?

• It changes with temperature

• It decreases with temperature

• It remains constant regardless of temperature

• It increases with temperature

Which phases of matter are included in the equilibrium expression?

• Solids and liquids

• Gases and aqueous solutions

• All phases

• Only gases

In the reaction involving ammonia, what is the coefficient of hydrogen gas?

• 4

• 1

• 2

• 3

For the ammonia reaction, how is the concentration of ammonia represented in the equilibrium expression?

• As a square

• As a single power

• As a cube

• As a fourth power

In the carbon monoxide reaction, which reactant is excluded from the equilibrium expression?

• Carbon dioxide gas

• Carbon monoxide gas

• Solid carbon

• Oxygen gas

What is the coefficient of carbon monoxide in the equilibrium expression for its reaction?

• 4

• 3

• 2

• 1

In the example of writing a balanced chemical equation from an equilibrium expression, what is the coefficient of oxygen gas?

• 5

• 4

• 3

• 6