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Merve Gonca Karaca. Rates of reactıon: effect of catalyst. INTRODUCTION. A catalyst increases the rate of a reaction but remains chemically unchanged.

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Presentation Transcript
  • 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. Acatalyst is not consumed in a chemical reaction!


  • The purpose of this experiment is to show the effect of a catalyst on the rate of a reaction.
  • Experiment : the speed at which the oygen was given off using a catalyst is inveestigated using the apparrus above.
  • 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.
  • 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
In the experiment...

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