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Investigation into the factors affecting the Heat of Reaction.

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Marc Abraham Investigation into the factors affecting the Heat of Reaction Magnesium + hydrochloric acid = magnesium chloride + hydrogen + heat. In this experiment we want to know how the length of magnesium affects the heat given off by this reaction. Mg + HCL = MgCL + H+ Prediction I predict that the longer the strip of magnesium used the larger the increase in temperature. This is because there is more surface area and more particles of mg to react with the HCL to produce product and heat is released, i.e. product formed is noted as a temperature change, as this is an exothermic reaction. Variables The variable in this experiment is the length of the magnesium strip. Controls * Volume of HCL * Concentration of HCL * Time (mins) Fair Test * To ensure that the surface area of the strips are constant make sure each strip is straight. * Make sure that the temperature is the same at the start of each experiment, as temperature is a factor that affects the rate of reaction and hence the amount of product and heat produced. ...read more.


HCL (ml) Start temp (oC) Finish temp (oC) Temp change (oC) 5 25 26 40 14 10 25 26 55 29 15 25 26 63 37 20 25 27 85 58 25 25 26 90 64 Analysis I predicted that the longer the length of Magnesium strip used, the greater the increase in temperature. My prediction proved true because both the Line Graph and Bar Chart show a larger increase in temperature every time the length of Magnesium strip increases, (the Bar Chart shows a larger bar for every increase in the length of Magnesium strip which means/shows a larger increase in temperature). The Line Graph shows a steady line of temperature change according to the length of Mg up to 15cm Mg where the extra 5cm of Mg would be thought to add roughly 14oC on to the temperature change and it shows only an 8oC difference in temperature. The Bar Chart and Line Graph are very much closely related for which the Line Graph shows the line of correlation/pattern of the Bar Chart, ...read more.


as this is an exothermic reaction. Less surface area is thought to be as the most likely reason for less temperature change. This explanation is then contradicted at 20cm length Magnesium strip where it created the 2nd largest temperature change and the largest temperature change for how long the Magnesium strip is. However, the 20cm Magnesium strip used could have been the only Magnesium strip that had not folded/bent over at all when the experiment was carried out which means maximum surface area for the length of Magnesium strip and therefore more heat given off because of more Mg particles exposed to the HCL, creating more of an exothermic reaction. There is not much further work that could be done to obtain more evidence and accurate data apart from using different and more professional equipment. The main problem that most definitely occurred during this experiment is heat loss. Heat loss can be resolved by using a lid with a seal to go on the polystyrene cup and with a hole specially designed to fit the thermometer, elastic to stop heat loss through the otherwise gap around the thermometer. 2 ...read more.

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