Chapter 11 (section 8)

Question 1

Define phase diagram

Answer 1

A map of the phase of a substance as a function of pressure and temperature

Question 2

Define triple point

Answer 2

The unique set of conditions at which all three phase of a substance are equally stable and in equilibrium

Question 3

Each of the lines in a phase diagram represents a set of temperatures and pressures at which a substance is in _____ between the two states on either side of the line

Answer 3

equilibrium

Question 4

The ____ ____ in a phase diagram represents the unique set of conditions at which three states are equally stable and in equilibrium.

Answer 4

triple point

Question 5

Define critical point

Answer 5

The temperature and pressure above which as super critical fluid exists

Question 6

The ____ ____ in a phase diagram represents the temperature and pressure above which a super critical fluid exists

Answer 6

critical point

Question 7

Why does the fusion curve (in a phase diagram) for most substances have a positive slope?

Answer 7

Because increasing pressure favours a denser state and for most substances that is a solid state

Question 8

Define critical temperature

Answer 8

The temperature about which a liquid cannot exist, regardless of pressure

Question 9

Define critical pressure

Answer 9

The pressure required to bring about a transition to a liquid at the critical temperature