NAME : Mohd Hazwan bin Md Khalid
PARTNER NAME : Abdul Afiq Arifin bin Khairuddin
GROUP : 1K02
LECTURER : Mrs.Fajrani Subaihah binti Juhari
: 18 August 2009
: Mohd Hazwan Bin Md. Khalid.
Partner Name : Abdul Afiq Arifin bin Khairuddin
: Mrs.Fajrani Subaihah Bt. Juhari.
: 18 August 2009.
: Chemical Equilibrium
: To study the effects of concentration and temperature on chemical equilibrium.
: To determine the equilibrium constant, Kc, of a reaction.
There are two kinds of chemical reaction, i.e. irreversible and reversible. A reversible reaction will
reach a dynamic equilibrium when the rate of the forward reaction is equal to the rate of the reverse
reaction. At this stage, one cannot see any changes in the system. However, this does not mean that
the reactions have stopped. The are still occurring but at the same rate
The factors that influence chemical equilibrium are:
Pressure (for reactions that involve gas)
Le Chatelier’s Principle is used to determine the position of the equilibrium when one of the above
factors is changed.
Le Chatelier’s Principle states that if a system at equilibrium is disturbed by a change in temperature,
pressure or concentration of one or more components, the system will shift its equilibrium position
in such a way so as to counteract the effect of the disturbance.
The effect of concentration
According to the Le Chatelier’s principle, the changes in concentration of any substance in a mixture
at equilibrium will cause the equilibrium position to shift its equilibrium position in such a way so as
to counteract the effect of the disturbance.
Consider a general reaction as follows:
A + B ⇌ C + D
If substance A or B is added to a mix