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Science department
Prep.3
4. Catalysts
A chemical substance changes the rate of the chemical reaction without
changing or being used.
It also doesn’t affect the nature of product.
+ve Catalysts -ve Catalysts
Increases the speed of the reaction Decreases the speed of the reaction
Most catalysts are positive.
Change the speed
without affecting
the begninning /
stopping
They aren't Catalysts They are bonded to
being affected properties reactants &
in its mass or
chemical nature separated rapidly
after product
formation
They decrease They are used
the energy in a few
amounts
needed for the
reaction 25
Second Term
Term
