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Decomposition of Hydrogen Peroxide Investigation.

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Introduction

Decomposition of Hydrogen Peroxide Investigation Hypothesis The inorganic catalysts will aid the breakdown of hydrogen peroxide as they all contain catalase. However, the catalyst with the highest concentration of catalase, liver, will help hydrogen peroxide compose most readily and thus give off the most oxygen. There are four main factors which affect the rate of chemical reactions: * Temperature * Concentration * Surface area * Presence of catalyst. For any reaction to take place, the reactants must come into contact. Anything which increases the chances of this happening will increase the rate of reaction. The reacting particles do not just have to bump into one another, they must collide with sufficient energy, and otherwise they do not react. The minimum amount of energy required is known as the activation energy. The more the particles collide in a given time, the faster the rate of reaction, this is called collision theory. Temperature: The higher the temperature at which the reaction takes place, the faster the rate of reaction- except when discussing enzymes. Increasing temperature increases the speed of the reacting particles as they move around. This speeds up the reaction in two ways- the particles collide more frequently and they have more energy when they collide, and both of these changes increase the likelihood that the particles will react. ...read more.

Middle

Risk Assessment Hydrogen peroxide is an irritant substance which when being used must be treated carefully and only used when the following safety precautions have been made. In this investigation I will be using a 10%concentration of hydrogen peroxide. Safety goggles must be worn at all times because H2O2 is an irritant and can burn the eyes if it comes into contact with them. Lab coats must also be worn during an investigation involving the substance as it may cause discolouration to clothing if it comes into contact with them. Gloves must be worn if spillage occurs. When disposing of the products, eye protection must be worn. In such an investigation where the student is examining the decomposition of hydrogen peroxide concentrations of the substance should be 20% or less. It is also important to check the amount of catalyst being used will not cause over-frothing and thus spillage of the liquid. Students must take care when removing ht cap of the bottle containing the substance in case of possible pressure build up. The bottle should otherwise be kept with other corrosive liquids in a cupboard. In the circumstances of contact, the following instructions should be followed. ...read more.

Conclusion

The errors in the methods were plentiful. Iron filings stuck to both the plastic measuring beaker and the test tube, so not exactly 0.25g catalysed the decomposition reaction. The skin of the potato and apple may have affected the efficacy of their ability to catalyse the reaction. Hydrogen peroxide decomposes by itself (although very slowly) but was measured out and left in test tubes for various amounts of time before having the catalyst added, this may have effected the rate of decomposition. Human error was found in ht measurement of the depth of the froth which was calculated by using a normal standardised ruler. The balance on which each of the catalysts were weighed out only measured to + 0.02 decimal places. By restricting the variables further so that only one becomes a factor affecting the experiment. The surface area and concentrations of the catalysts were not controlled Extra work that may be completed to further the investigation may the testing of a greater range of catalysts. The speed of the reaction may also be recorded to give a fair analysis of the catalysts on the rate of reaction. For example, the method may be altered to record how long it takes for 1cm3 of froth to be collected after the addition of each catalyst to the hydrogen peroxide. Hannah McWilliam 12.8 ...read more.

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