Phase equilibrium.siam (pdf file)

3. Presentation
on
PHASE
EQUILIBRIUM

4. Created By:
Md. Kamruzzaman Siam

5. Equilibrium
Equilibrium is a state in which there are no
observable changes as time goes by.
Chemical equilibrium is achieved when:
1.) the rates of the forward and reverse
reactions are equal and
2.) the concentrations of the reactants
and products remain constant

6. Equilibrium
 There are two types of equilibrium:
Physical and Chemical.
 Physical Equilibrium: Equilibrium between two
phases of the same substance. Changes that occur are
physical.
 Chemical Equilibrium: Chemical equilibrium is
the point at which the rate of the forward reaction is
equal to the rate of the reverse reaction.

7. Physical Equilibrium

8. Chemical Equilibrium

9. Definition of phase:
 Any part of a system which is physically separated
from other parts of the system by a distinct boundary.
 A phase can be a solid, liquid, vapour (gas) or aqueous
solution which is uniform in both chemical constitution
and physical state.

10. Phase Equilibrium:
A phase equilibrium is a balance between phases, that is
the coexistence of two or more phases in a state of dynamic
equilibrium.

11. Heterogeneous system ---- system with more than one phase
Homogeneous system ---- system consists of one phase only
Example of Phase Equilibrium:

12. Homogeneous:
The prefix “homo” – indicate sameness
Homogeneous – A homogeneous mixture
has the same uniform appearance
throughout

13. Heterogeneous:
The prefix “hetero” – indicate difference
Heterogeneous - A heterogeneous mixture
consists of visibly different substances or
phases.

14. PHASE
system
1) The mixture of ice and water = have two
phase which is solid and liquid
2) The mixture of oxygen gas and nitrogen
gas = have one phase which is gas
phase (the system is homogen)
3) The mixture of oil and water = have 2
same phase(liquid). Oil and water are
not homogen and have the boundaries to
separate both phase
4) CaCO3(s) CaO(s) + CO2(g)
= 3 phase (2 solid,1 gas)
Heterogeneous system
Heterogeneous system
Heterogeneous system
Homogeneous system
EXAMPLES of