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To find out what factors affect the decomposition of Hydrogen Peroxide.

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Introduction Aim: - To find out what factors affect the decomposition of Hydrogen Peroxide. The substances that I am going to use in this investigation are Manganese Dioxide and Hydrogen Peroxide. The Manganese Dioxide is a chemical catalyst and will be used to speed up the breaking down of Hydrogen Peroxide. I am using a chemical catalyst because it would give a more accurate result compared to organic or biological catalysts. This because organic and biological catalysts are enzymes, which require a certain temperature and will need to be kept constant as they work best between that temperatures. For example, 37 degrees centigrade to 40 degrees centigrade are temperatures when enzymes work best. This is because enzymes are found in the human body and are used for digestion. Also the human body has a body temperature of 37 degrees centigrade, which is why the enzymes work best at that temperature. Enzymes such amylase is found in the mouth breaks down starch in to maltose. In the stomach pepsin is used to break down protein in to polypeptides. In the small intestines using the enzyme peptidase produces amino acids when polypeptides are broken down. Also this is where the maltose is broken down into glucose using the enzyme called maltase. Hydrogen Peroxide with a chemical equation of H2O2 looks very similar to the equation for water H2O however having an extra Oxygen atom compared to water but this changes the properties of Hydrogen Peroxide. ...read more.


Hydrogen Peroxide breaks down in to Oxygen and water. To collect data I cannot measure the amount of water produced. This is because it will be very difficult to separate the water produced as it has been dissolved with the hydrogen peroxide. Instead I am going to measure the volume of Oxygen in centimetres cube, as the Oxygen bubbles will not easily dissolve in water. I am going to measure the oxygen by collecting the gas in a measuring cylinder, which is full of water. The theory is that when the gas goes in to the cylinder by a delivery tube, the oxygen gas pushes out the water. This process is called the downward displacement of water. I have chosen to investigate how the concentration of Hydrogen Peroxide affects its decomposition. Prediction I think that if I increased the concentration of the Hydrogen Peroxide the speed of the reaction will increase. I also think that as I increase the concentration of the Hydrogen Peroxide, more Oxygen will be produced. This will happen because the higher the concentration the more easy it is for the Manganese Dioxide to react with the Hydrogen Peroxide. This because the concentration has an affect on how strong the Hydrogen Peroxide is. The higher the concentration the stronger the Hydrogen Peroxide is likely to be. ...read more.


Average vol. oxygen (Cm3) 10 40 20 30 30 20 40 10 50 0 Experiment 1 Experiment 2 Experiment 3 Hydrogen Peroxide (Cm3) Water (Cm3) Volume of oxygen (Cm3) Volume of oxygen (Cm3) Volume of oxygen (Cm3) Average vol. oxygen (Cm3) 10 40 0 17 20 12.3 20 30 23 35 32 30 30 20 29 67 54 50 40 10 83 112 81 92 50 0 129 157 118 134.6 Results Conclusion From my results I have noticed that as I increase the concentration of the Hydrogen Peroxide, the more oxygen was produced. Looking at my line graph as it shows an increase of the volume of oxygen produced can prove this. If the investigation would be left for longer than one minute, the graph would eventually show the graph becoming steady meaning that the reaction is complete. I have also noticed that when the reaction was taking place, the conical flask had become warm. This means that the reaction was an exothermic reaction. Exothermic means that heat was given off during the investigation. The manganese dioxide speeds up the decomposition of hydrogen peroxide. If I were to do this investigation again, I would change a few things like doing the experiment more than three times, as this would give better and accurate results. I would use better ways to collect the oxygen, as sometimes the oxygen was lost whilst changing the measuring cylinder. This problem may have affected my results by giving me false impressions about the investigation. ...read more.

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