Experiment 10.docx - Prabhleen Sidhu Chem 1A Lab Partners...

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Prabhleen Sidhu Chem 1A Lab Partners: Harnoor Sidhu Experiment #10 “Heat of Reaction and Hess’s Law” Objective of the Experiment:
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The purpose of the experiment is to determine the total heat capacity of a basic styrofoam cup calorimeter. Also, to measure the heat (enthalpy) change of two related chemical reactions. And, to calculate the heat change of a third reaction by applying Hess’s Law. Method of the experiment: The calorimeter used in the experiment is made up of two styrofoam cups that are stacked on top of each other and then put into a small 250 mL beaker. In the experiment, two reactions are used, and they are both exothermic. The amount of heat evolved is calculated from the rise of temperature of the water in the calorimeter. From the amounts of Mg and MgO reacting, ΔH 1 and ΔH 2 will be determined. From these results, ΔH 3 can be calculated. In this experiment, heat absorbed by the the calorimeter will be taken into consideration.
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