Chemistry: Magnesium Experiment Essay

625 Words Mar 25th, 2016 3 Pages
During the experiment we encountered various problems. While weighing the magnesium, some of the strips fell and other strips fell off, therefore we had to weigh it again. When we did the first reaction, the final temperature of the reaction rose to only about 65C due to the fan and air conditioning in the area that we were working in. We consulted with the instructor, and he told us that the final temperature had to be at least 70C. We moved to another area where the fan was not blowing directly at us, and we did the first reaction again, finally obtaining the desired temperature. The next problems we encountered were in the calculations of the enthalpy for the reaction: Mg(s) + 1/2O2(g)  MgO(s)
At first, we
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The lab taught us how to apply Hess’s Law in calculating the enthalpy of a reaction that would have been too dangerous to recreate in a school laboratory setting. We also applied our knowledge of calorimeter calculations to obtain the enthalpies of: Mg(s) + 2HCl(aq)  MgCl2(aq) + H2(g) MgO(s) + 2HCl(aq)  MgCl2(aq) + H2(l)
During the lab we learned the branch of thermochemistry, the study of the energy changes taking place during chemical reactions (http://www.geocities.com/capecanaveral/launchpad/5226/thermo.html). Calculations of enthalpy is especially important in thermodynamics, the relationships between heat and other properties (such as temperature, pressure, density, etc.) (http://www.kxxv.com/Global/story.asp?s=5738506). It is important as well in Applied thermodynamics which is the science of the relationship between heat, work, and systems that analyze energy processes. The energy processes that convert heat energy from available sources such as chemical fuels into mechanical work are the major concern of this science (http://www.taftan.com/thermodynamics/). Calculations in enthalpy are used all the time in our society today, especially in the search for alternative fuels. Completing this lab taught us about the importance of enthalpy and

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