Phase diagram Flashcards
define phase diagram
It is a graphical representation the conditions when two or more phases of a system exist in equillibrium
how many chemical species does a one component system have?
One, they are called pure substances
temperature is plotted in the ____ axis and pressure is plotted in the ____ axis
X and Y respectively
True or False
a substance exists in solid state at high temperature and low pressure.
False
It exists at low temperatures and high pressure while gas state is reached with high temperature and low pressure
the boundary between the phases is represented by a ______.
Line. It is obtained by joining the transition temperature between the two phases at different pressures
A boundary between liquid and vapour phase is called _______
Vapourization curve
A boundary between solid and vapour phase is called _______
Sublimation curve
What do we call the point where the three states coexist?
Triple point
What does the slope of the transition curve depend upon?
the nature of the variation of transition temperature with pressure
in the phase diagram of water, is the sublimation curve positive or negative?
Positive. As the pressure increases, the sublimation point also increases.
in the phase diagram of water, is the melting curve negative or positive?
Negative. As the pressure increases, the melting point in water decreases.
what is the anomalous behaviour of water?
It is the special property of water to decrease the melting curve as the pressure increases
define critical temperature
It is the maximum temperature at which the substance can exist in liquid state.
define critical pressure
It is the MINIMUM pressure required to liquefy the vapors at critical temperature
define critical point
In thermodynamics, critical point is the end point of a phase equillibrium diagram.
