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Catalyst Essay

653 words - 3 pages

WWW.GCSESCIENCE.COMCatalysts used for the Decomposition of Hydrogen Peroxide.At room temperature hydrogen peroxide decomposes very slowly. The presence of a catalyst may cause it to decompose quickly.hydrogen peroxide oxygen + water. 2H2O2(aq) O2(g) + 2H2O(l)The rate of the reaction can be followed by recording the volume of oxygen produced (you must know a test for oxygen).The catalyst used is Manganese(IV) oxide - MnO2(s) Using more catalyst will show an increase in reaction rate. This is because more catalyst will have a greater surface area for the reaction to take place.The reaction can be performed using different catalysts to compare how well each catalyst works for the same reaction. A fair test must use the same amount of each catalyst.As you can see from the graph, Manganese(IV) oxide (MnO2(s)) is the best catalyst for this reaction. 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)).The decomposition of hydrogen peroxide solution.hydrogen peroxide oxygen + water. 2H2O2(aq) O2(g) + 2H2O(l)The reaction is carried out in a closed flask which has a gas syringe connected to the top of it.The reaction is started by adding a catalyst to the hydrogen peroxide. The catalyst is manganese(IV) oxide.The volume of oxygen in the syringe increases as the reaction proceeds. The volume of oxygen can be noted every 30 seconds, and a graph of volume against time can be plotted. The gradient of the plot (the steepness of the slope) shows how fast the reaction is going.GCE CHEMISTRY BCatalytic decomposition of hydrogen peroxide by inorganic catalystsHydrogen peroxide decomposes to form water and oxygen according to the equation:2H2O2 → 2H2O + O2This reaction is catalysed by manganese(IV) oxide.You can monitor the production of oxygen by...

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