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Factors, Which Affect the Rate of Reaction

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Factors, Which Affect the Rate of Reaction There are certain factors which affect the rates of reaction in an experiment. These factors are: * Pressure * Temperature * Concentration * Surface area / particle size and * The addition of a catalyst The factors that I will be concentrating on are temperature, concentration and surface area / particle size. Pressure Pressure influences the rate of reaction only when the reactants are in their gas phase. Pressure does not affect them much when they are either solids or liquids. By increasing the pressure, you squeeze the molecules together so you will increase the frequency of collisions between them and their surrounding container. Temperature When the temperature of a reaction increases, heat is supplied to the particles of the reactants involved. ...read more.


on their density, i.e. on their concentration. The more crowded the particles are, the more often we should expect them to bump into each other. Surface Area A solid in a solution can only react when particles collide with the surface. The bigger the area of the solid surface, the more particles can collide with it per second, and the faster the reaction rate is. You can increase the surface area of a solid by breaking it up into smaller pieces, therefore, a powder has the largest surface area and will have the fastest reaction rate. This is why catalysts are often used as powders. The Addition of a Catalyst A catalyst is a substance which alters the rate of a chemical reaction, but remains chemically unchanged at the end of a reaction. ...read more.


O2(g) + 2H2O(l) Hydrogen peroxide is stable at room temperature, the presence of a catalyst however, may cause it to decompose. The catalyst used is Manganese(IV) oxide - MnO2(s). Using more catalyst will show an increase in reaction rate. This is because more catalysts will have a greater surface area for the reaction to take place. The reaction can be performed using (the same amount) of different catalysts, to compare how well each catalyst works for the same reaction. As you can see from the graph, Manganese(IV) oxide - MnO2(s), is the best catalyst. The gradient of the plot is greater (steeper) than the other two. Copper(II) oxide - CuO(s), is not as good as manganese(IV) oxide but is better than zinc oxide - ZnO(s). However, without a catalyst, hydrogen peroxide will not decompose. Khayrul Motaleb 11Gr ...read more.

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