7.4 Phase Transition Diagram/Heating Curve

Question 1

What is a phase transition diagram?

Answer 1

heating curve = plots the temperature of the sample versus the amount of heat absorbed

Question 2

What does not change during a phase transition?

Answer 2

temperature

Question 3

Which is always greater: heat of vaporization or heat of fusion?

Answer 3

heat of vaporization

Question 4

What does the phase of a substance depend on?

Answer 4

temperature
pressure

Question 5

What is a phase diagram?

Answer 5

shows how phases are determined by temperature and pressure

Question 6

What does the boundary line in a phase diagram represent?

Answer 6

two phases are in equilibrium

Question 7

What does crossing a boundary line in a phase diagram represent?

Answer 7

phase transition

Question 8

What is normal melting point on a phase diagram?

Answer 8

temperature at the point where the 1 atm line crossing the solid-liquid boundary

Question 9

What is the normal boiling point on a phase diagram?

Answer 9

temperature at the point where the 1 atm line crosses the liquid-gas boundary

Question 10

What is the triple point of a phase diagram?

Answer 10

temperature and pressure at which all three phases exist simultaneously in equilibrium

Question 11

What is the critical point of the phase diagram?

Answer 11

located at the end of the liquid gas boundary; after this point the substance displays properties of both a liquid and a gas

Question 12

What is a supercritical fluid?

Answer 12

substance that displays properties of both a liquid and a gas and exists under conditions of high temperature and pressure; no amount of pressure can force the substance back into its liquid phase