Chemistry

Introduction to Kinetics II (Catalysis)


Catalysis

A catalyst accelerates a reaction without being consumed itself. Many exothermic and exergonic reactions take place extremely slowly at room temperature, they are inhibited. This inhibition can be lifted by means of catalysts and the reaction can take place.

The catalyst does not affect the position of equilibrium, the equilibrium is only reached more quickly by the catalyst. Different catalysts have different levels of effectiveness.

Fig.1
burning sugar

Sugar doesn't burn. If you try to light a lump of sugar, it will melt and char, but will not ignite. If, on the other hand, some cigarette ash is sprinkled on the piece of sugar, it can be lit and continues to burn for a while. The cigarette ash acts as a catalyst for the burning of sugar.


Video: Catalysts. Kinetics. AP Chemistry. Khan Academy (December 2021).