RATES OF

REACTION: EFFECT

OF CATALYST

Merve Gonca Karaca

INTRODUCTION

A catalyst increases the rate of a reaction but remains chemically unchanged.

The catalyst allows the reaction to proceed by an alternate reaction mechanism with a lower activation energy. A catalyst is not consumed in a chemical reaction!

MANGANESE PEROXİDE

AIM

The purpose of this experiment is to show the effect of a catalyst on the rate of a reaction.

EXPERIMENT

Experiment : the speed at which the oygen was given off using a catalyst is inveestigated using the apparrus above.

OBSERVATION

This reaction normally proceeds very slowly. When the catalyst, manganese dioxide, is added, the rate of the reaction increases appreciably; this can be seen by the large volume the oxygen gas bubbles through the hyrdogen peroxide solution.

CONCLUSION

When a catalyst such as Manganese dioxide is added in a reaction, it speeds up the reaction .

The products form fast. Activation energy is lowered by catalyst. At the end of this experiment, hydrogen

peroxide is decomposed into water and oxygen.

In the experiment...

2 H2O2(aq) manganese dioxide 2 H2O(l) + O2(g)

THANKS...