CHM271 CHAPTER 6 PHASE EQUILIBRIUM

What is a "phase" in a phase equilibrium system?

• A chemical compound

• A physical state with uniform properties

• A homogeneous mixture

• A heterogeneous mixture

Which of the following has 3 phases present?

• Water and ethanol

• Ice and steam

• Ice, water, and steam

• Salt in water

How many components are in the water-ice-steam system?

• 0

• 1

• 2

• 3

What is the formula for Gibbs Phase Rule?

• f = p – c + 2

• f = c + p – 2

• f = c – p + 2

• f = c × p + 2

In a single-phase system of water, the degree of freedom is:

• 0

• 1

• 2

• 3

What happens to the degrees of freedom at the triple point of water?

• Becomes 3

• Becomes 1

• Becomes 2

• Becomes 0

In the CO₂ phase diagram, what happens at 1 atm pressure?

• CO₂ melts

• CO₂ sublimates

• CO₂ boils

• CO₂ condenses

Which statement is true for water’s solid-liquid equilibrium line?

• It has a positive slope

• It slopes to the right

• It shows increasing melting point with pressure

• It slopes to the left

What does Raoult’s Law relate to?

• Boiling point of solids

• Solubility of gases

• Vapour pressure of solutions

• Density of liquids

Which mixture obeys Raoult’s Law exactly?

• Water–salt

• Water–ethanol

• Benzene–toluene

• Oil–water