Equilibrium Expressions and Vapor Pressure

The video tutorial explains the concept of equilibrium between liquid water and water vapor at 25°C. It discusses the reaction quotient, which is the partial pressure of gaseous water, and how it relates to the equilibrium constant. The tutorial highlights that vapor pressure is equivalent to the equilibrium constant in liquid-gas equilibria and is temperature-dependent. It also covers how to use phase diagrams to determine vapor pressure and explains the effect of reversing reactions on equilibrium constants.

What is the state of water when it is in equilibrium at 25°C?

• Only liquid

• Only gas

• Both liquid and gas

• Neither liquid nor gas

Why do pure liquids and solids not appear in equilibrium expressions?

• They have constant concentrations

• They are always in excess

• They are not involved in reactions

• They react too quickly

What does the vapor pressure of water represent in terms of equilibrium?

• The boiling point of water

• The equilibrium constant

• The density of water

• The solubility of water

How does vapor pressure change with temperature?

• It fluctuates randomly

• It remains constant

• It decreases

• It increases

What is the vapor pressure of water at 25°C?

• 0.07 atmospheres

• 0.05 atmospheres

• 0.03 atmospheres

• 0.01 atmospheres

Where can you find the vapor pressure of water at a specific temperature?

• On a solubility chart

• On a chemical equation

• On a phase diagram

• On a periodic table

What happens to the reaction quotient if a reaction is reversed?

• It doubles

• It remains unchanged

• It becomes the reciprocal

• It halves

How is the equilibrium constant affected when a reaction is reversed?

• It becomes zero

• It doubles

• It remains the same

• It becomes the reciprocal

What is the relationship between vapor pressure and equilibrium constant in physical equilibria?

• They are inversely proportional

• They are unrelated

• They are equivalent

• They are additive

What must be done to the equilibrium constant when reversing a chemical reaction?

• Take the reciprocal

• Divide by two

• Add one

• Multiply by two