Chemical Reactions Of Energy And How It Changes

938 Words Mar 28th, 2016 4 Pages
Thermochemistry deals with energy and how it changes. We performed chemical reactions in a calorimeter, which is a device scientists use to determine the amount of heat produced by a process (or change). Processes that absorb energy are endothermic and processes that release energy are exothermic. Endothermic, processes that absorbed energy produced positive results. Where as, exothermic, processes that release energy produced negative results. This experiment also dealt with specific heat. Specific heat is the amount of heat gained or lost when one gram of a substance changes temperature by one degree Celsius. Our experiment this week explored these concepts.
Experimental Procedures
In this experiment, we performed chemical reactions in a calorimeter to determine the amount of heat produced by heat (temperature) change. In part one of the experiment, we set up our calorimeter as shown in a diagram given. We connected it to our computer for data collection with the temperature probe. To start data collection, we first mixed 15 mL of 1.0 M HCl solution and 20 mL distilled water and recorded the initial temperature. Next, we added 25 mL of 1.0 M NaOH solution to the mixture. To homogenize the mixture, mix gently until the maximum temperature has been reached and record that as the final temperature. Next, we needed to calculate our results for the heat of reaction ΔH in units of Joules. In a chart, we recorded the total mass of our mixture and determined the number of moles…
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