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# How does the mass of Ammonium chloride affect the temperature drop?

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Introduction

Cool Packs How does the mass of Ammonium chloride affect the temperature drop? Variables Amount of water Amount of Ammonium chloride Ambient temperature Equipment i.e. material made of Amount of stirring Time allowed Prediction I predict that the more Ammonium chloride that is used the lower the temperature will become, the waters energy is used to break bonds when Ammonium chloride is added, because the energy is being taken from the water and not as much is given back making the reaction endothermic therefore the water temperature will drop. I also predict that the temperature will come to a point where it doesn't get any cooled this is because the mixture becomes saturated. General idea The idea of this experiment is to find out how the amount of ammonium chloride affects the temp change. I will do this by doing a number of the same experiment using different amounts of Ammonium chloride and measuring the temp change. ...read more.

Middle

/ 3) = average 9. Repeat steps 1-9 with next mass on list until all required mass have been completed. Results table Conclusion and interpretations I have discovered that the more Ammonium chloride that is added to the water the cooler it gets until it starts to level off at a 12?C drop. I got the results that I predicted. Understanding I understand that the temperature will drop until a certain point where it levels off at a max temperature drop of 12?C. I think it levels of at 12?C because I the mixture becomes saturated, meaning that the energy in the water is no longer efficient to break and more bonds hence making the water cooler. The water runs out of energy because the reaction is endothermic meaning that more energy is used to break bonds than is given back when bonds are created therefore all the energy will eventually be used. ...read more.

Conclusion

The same reasons as above would be the most like to be making the results unreliable as well. Again the unreliable results could be re-done but some of the factors like ambient temperature might not be reproduced properly. My results support my conclusion by showing that the temperature does actually drop to a point where there isn't enough energy to break and more bonds or until it becomes saturated. This is also what I predicted which has been proved to be correct. I could improve this experiment by doing all the experiments myself to make sure that all the variable where keep equal (bar the ones being tested), I could also do the experiments more that three time, because the more results you have the better your average will become. Further research could be done by studying the properties of Ammonium chloride, to find out more about why more energy is need to break bond than is given off when bonds are made. Most of this research would be available online. Neil Brown 11F ...read more.

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