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Summary Chemical Equilibrium

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Covers all that is needed in the Matric chemistry syllabus under the chemical equilibrium section all definitions taken from the SAGS and includes diagrams

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  • August 28, 2019
  • 8
  • 2019/2020
  • Summary
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CHEMICAL EQUALIBRIUM

DYNAMIC EQUALIBRIUM
Dynamic equilibrium – occurs when two processes are occurring
simultaneously at the same rate, in a closed system
Open system – a system in which both energy and matter can be exchanged
between the system and its surroundings
Closed system – a system in which mass is conserved inside the system but
energy can enter or leave the system freely


DYNAMIC CHEMICAL EQUALIBRIUM




 Concentration of reactants is high and rate of forward reaction is high
 Reactants being consumed rate of forward reaction decreases
 No products at start of the reaction, product is being formed reverse
reaction rate is high
 Products are being consumed rate of reverse reaction decreases

, FACTORS THAT EFFECT DYNAMIC EQUALIBRIUM
1) Change in concentration
2) Change in temperature
3) Change in pressure


LE CHATELIERS PRINCIPLE
Le Chateliers principle – when an external stress (change in concentration,
pressure or tempreture) is applied to a system in chemical equilibrium, the
equilibrium point will change in such a way as to counter act the stress


CHANGE IN CONCENTRATION
Formula:
Addition of HCL
 This will result in a reaction between the H2O and the HCL creating more
Cl- ions
 This will result in the reverse reaction being favoured and an increase in
the rate of the reverse reaction

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