Equilibrium Constant ( KC )

The equilibrium constant of a chemical reaction is the value of the reaction quotient when the reaction has reached equilibrium. At any given temperature, the equilibrium constant has a value which is independent of the initial and actual concentrations of the reactant and product species. more info

Reference : http://scienceaid.co.uk/chemistry/physical/eqconstants.html

To calculate Kc you take the concentrations of the products, and then do each one to the power of the number of moles of it, from a balanced equation. Then do the same for the reactants, and divide products by reactants. more info

** No need to concern about the units of K_C

Additionally, the equilibrium constant can be used to determine the composition of a system at equilibrium via equilibrium will.

Favor products

Favor reactants 

                                                                               

Reference : http://www.youtube.com/watch?v=xfGlEXWDRZE

Video From : http://www.youtube.com/watch?v=xfGlEXWDRZE

Dynamic Equilibrium

It is a type of equilibrium that rate forward reaction equals to rate backward reaction. Once the reaction reaches equilibrium, the concentrations of all chemicals remain constant because the chemicals are being comsumed and made at the same rate. 

 Reference : http://edublognss.wordpress.com/2013/04/16/chemical-equilibrium/

Reference : http://www.wyzant.com/resources/lessons/science/chemistry/dynamic_equilibrium

 Condition for dynamic equilibrium
1)    That reaction must be reversible.

Reference : http://scienceaid.co.uk/chemistry/inorganic/halogens.html

                                                                        

 Reference : http://www.wwk.in/chemistry/chemical-reactions/chemical-equilibrium

2)    It must be in closed system

**Dynamic equilibrium does not need to occur only in chemical reaction. Furthermore,

dissolution can also have dynamic equilibrium occur.

 

Reference : http://biochemhelp.com/solubility-product-constant.html

Video From : http://www.youtube.com/watch?v=wlD_ImYQAgQ

Types Of Reaction

How many types of chemical reaction?

1)
Reversible reaction    :

It is the reaction that can go forward and backward at the same time.
It will use the sign,  , to show that it is reversible. It has to occur 
in closed system and results in occurring of equilibrium

                                   
 e.g.

Reference : http://www.revisescience.co.uk/2010/schools/ilford/acequations.asp

Reference : http://dl.clackamas.edu/ch105/lesson7equilbria_lechatelier.html

2)Irreversible reaction  :

It is the reaction that can go forward only. It shows by using the sign , 
, to show that it is irreversible. Equilibrium will never occur in this kind of reaction.

                                   
 e.g.

Reference : http://jino-ultraman.blogspot.com/2009/12/irreversible-chemical-reactions.html

Reference : http://en.wikipedia.org/wiki/Combustion

Video From : http://www.youtube.com/watch?v=br8lKynV1Hc

System In Term Of Chemistry

What is system in term of chemistry?

The system is the specific part of the universe in which you are interested.

What’s about surrounding and boundary?

Surrounding is the things that are outside the system and boundary is the surface that encloses the system.

Reference : http://en.wikipedia.org/wiki/Entropy

How many kinds of system do we have?
1)Open  system                 :        

 It is the system that has mass transfer with the environment but it still has energy transfer.
 It does not mean that it is in open container

2)Closed system               :        

 It is the system that does not have mass transfer with the environment it still has energy
 transfer. It does not mean that it is in open container.

3)Adiabatic system           :        

 It is the system that is thermally insulated from its surrounding.

4)Isolated system              :        

 It is the system that does not allow both energy and mass transfer to occur.

Characteristics

1)Homogeneous system is the system that has 2 phases of substances in it.   

2)Heterogeneous system is the system that has only 1 phase of substance in it.

Video From : http://www.youtube.com/watch?v=v8MLMWlUwY8