Question

8. Provided is the phase diagram of an unknown substance D E G А F Pressure B Temperature Please identify what every letter represents (state of matter, state of matter change, etc.)(15 points)

Answer 1

This diagram is called the phase diagram. This diagram shows the transition state's physical variables on a graph. The region containing point A and the pressure axis on one side represents the SOLID PHASE. The region touched by the temperature axis (the bottom-most part) is gas and the other part is liquid as shown below.

Critical point Melting Liquid Freeding Vaporizajion Solid Pressure Cogdensation Subligation Triple point Gas Deposition Temperature

so,

A - solid phase of the substance

B - represents TRIPLE POINT. this is a point where all three phases of matter(here liquid, gas and solid are in equilibrium with each other)

C - this phase represents a transition phase between solid and gas. (sublimation/ hoar frost(deposition))

D - point D represents critical point. This is the point where the properties of liquid and gas become non-distinguishable

E - this point represents the state in melting condition. ie solid and liquid equilibrium

F - represents boiling of the state. here the liquid and solid phase are in equilibrium