Factors Which Influence the Rates of Reactions

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REFERENCES GENERAL CHEMISTRY FOR ENGINEERING AND SCIENCE II CHE 152-50 Factors Which Influence the Rates of Reactions pages 1-10 OBJECTIVES To examine the factors which cause the rate of chemical reactions to change. QUESTION The question that was proposed for investigation was: Do all factors change the rate equally? Background Discussion For this experiment you have to have a basic understanding of Collision Theory to understand what’s going on in the experiment. Collision Theory is a model of chemical reactions in which a reaction occurs after a collision containing enough energy occurs between two reactant molecules. This model has five factors which can be affected and they are the nature of reactants, temperature, concentrations, surface area and catalyst. If one of these were changed then the reaction could occur faster or slower depending on what was changed. Sample Calculations Rate Law: 2A + B→C,is rate=k[A][B] (Lab Guide pg.6) PROCEDURE (Attached) DATA TABLES/CALCULATIONS (Attached) RESULTS HYPOTHESIS All factors change the rate of reaction equally. OBSERVATIONS In this experiment there five different phases and in each a different factor of the Collision Theory was tested. The first phase was called, Nature of the Reactants and it had three parts to it. In the first part of it which was steps 1-4, 5 pieces of mossy zinc were put into 3ml of 2M H_2 〖SO〗_4 and during this time bubbles were produced. After a few minutes the zinc was removed from the acid and it was now clean zinc. In the second part of phase 1 which was steps 5-8 4 different pieces of clean zinc were placed in 4 different acids. The acids were Hydrochloric ... ... middle of paper ... ...e will also become faster. In phase one, Nature of the Reactants five different metals were placed in the 2M HCl they all reacted differently with magnesium being the most reactive and copper being the least reactive. In phase two, Concentration, zinc was placed in different concentrations of 6M HCl. The higher the concentration was the more reactive the metal was. Next in phase three, Temperature, zinc was added to 6M HCl which was a different temperatures and the zinc was the most reactive with the HCl in the boiling water and least reactive with the HCl in the ice bath. Then in phase four, Surface Area, the powered zinc was more reactive then the piece of zinc in the 6M HCl because it had more surface area to be covered than the piece of zinc. Lastly in phase 5, Catalyst, the 3% H_2 O_2 was reactive with the 5 drops of 〖FeCl〗_3 but not with the 5 drops of water.
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