Question

6. Use the phase diagram below to answer the following questions. Pressure (Atmosphere) 45° 60° 100° 110° Temperature (°C)

Answer 1

a) section A represent the solid phase

b) section C represent the liquid phase

c) section B represent the gas phase

d) letter 'd' represent the triple point

Triple point is a perticular point in the phase diagram ( perticular temperature and pressure) where the three phases ( solid, liquid and Gas) exists simultaneously

Here it is 45 degree Celsius and 0.5 atm pressure

e) normal melting point at 1 atm pressure is 60° celcius.

f) normal boiling point at 1 atm pressure is 100° celcius

h) three phases coexist at triple point , i.e., at 45° celcius and 0.5 atm pressure.

g) the point "e" which represents 110°c is called the criteria point , above which there is no line of demarcation between liquid and gas i.e., we cannot distinguish between those phases

Therefore above this temperature it is impossible to liquify the substance no matter what the pressure is

i) by just increasing the pressure

j) when a substance changes its phase from solid to gas without going through liquid phase , then it is called sublimation....