Question

1) Use the diagram for water. At what temperature can all 3 phases exist? Select one of the following:

a) None of these

b) 0°C

c) 100°C

d) 374°C

2) Use the diagram for water. What phases can exist at 0.4 kPA? Select one of the following:

a) Solid and liquid only

b) Solid and gas only

c) Solid, liquid and gas

d) Liquid and gas only

3) Use the diagram for water. What's happening along line DB? Select one of the following:

a) None of these

b) Solid/gas phase transition (sublimation or deposition)

c) Solid/liquid phase transition (melting or freezing)

d) Liquid/gas phase transition (boiling or condensation)

D 22,089 Critical point C Ice (solid) Water (liquid) Pressure (kPa) 101 Triple point 0.6 B Water vapor (gas) A 0 0.01 100 374 Temperature (°C)

Answer 1

A)Three phases of water coexist together at temperature called triple point and as per the graph it's point B which is at 0.01° C.Hence none of the given Option is true.

B)At 0.4kPa as evident from graph,two phases of water do exist and they are solid and gas only.Thus Option b is true.

C)Line DB is interface between solid and liquid phases of water.Hence it represents transition between those two phases.Hence, Option c is true.