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Chapter 7 ­ Equilibrium

Reversible reactions

Reversible reactions can go backwards and forwards. For a chemical reaction it means that the
reactants will react to form products but then the products would react to form the reactants. It is
very difficult to fully change the reactants into products.

Copper sulfate…

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The position of the equilibrium will change if the concentration of one reactants or products is
changed.

ethene + steam ethanol vapour

If the concentration of ethane is increased:

The position of equilibrium will shift to resist the change
The position of equilibrium will shift to the right
More ethanol…

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If the temperature is decreased the opposite of the above will take place.



Effects of catalysts

Catalysts have no effect on the position of the equilibrium but will still have effect on the rate of the
reaction.

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