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right so more of the yellow



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CIE-IGCSE-Chemistry-7-RN

right so more of the yellow product is formed

•  A decrease in the concentration of ICl or Cl

2

 causes the equilibrium to shift to the left 



so more of the dark brown reactant is formed

CHANGE

HOW THE EQUILIBRIUM SHIFTS

INCREASE IN  

CONCENTRATION

EQUILIBRIUM SHIFTS TO THE RIGHT TO REDUCE THE 

EFFECT OF INCREASE IN  THE CONCENTRATION OF A 

REACTANT


DECREASE IN  

CONCENTRATION

EQUILIBRIUM SHIFTS TO THE LEFT TO REDUCE THE EFFECT 

OF A DECREASE IN REACTANT (OR AN INCREASE IN THE 

CONCENTRATION OF PRODUCT)




7 CHEMICAL REACTIONS

YOUR NOTES

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7.2  REVERSIBLE REACTIONS  cont...

EXAM TIP


When the conditions at equilibrium are changed, the system always responds by doing 

the opposite.

For example if the concentration is increased the system tries to reduce it by changing 

the direction of the reaction or if the temperature is increased, the system will try to 

reduce the temperature by absorbing the extra heat.


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