# Stahl, Heat of Solution Post Lab - Ashlynn Stahl Oct 3rd...

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Ashlynn Stahl Oct. 3rd, 2019 Heat of Solution Post Lab 1) Explain why heat exchange is studied in a calorimeter (the two Styrofoam cups). Heat exchange is studied in a calorimeter so that the heat being measured is at an accurate temperature and is being held in the cup so that the change in temperature is the most accurate. 2) Name two types of products (things you can buy at a store) that use endothermic or exothermic reactions. Hot packs that people use when they are cold or in pain and cold packs use exothermic reactions. 3)Explain the source of energy (read: heat) in both endo and exothermic reactions. Describe where the energy starts and where it goes as the progress of the reactions. The energy(heat) in endothermic reactions comes from the surrounding environment. It starts in the surrounding environment of whatever is going to end up being heated, then is absorbed into that object. The energy(heat) in exothermic reactions comes from the reaction itself, causing the surrounding temperature to rise. It starts in the mixture itself then, when the

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Unformatted text preview: reaction occurs it goes from the reaction into the surrounding environment. fill in the following data tables: Data Table: Ammonium Chloride Data Item Value 1 Mass of ammonium chloride used 1.00 g 2 Moles of ammonium chloride used .019 mol 3 Starting temperature of water 20.6 ˚C 4 Ending temperature of water 17.3 ˚C 5 Change in temperature (Data line4, - Data line 3, ) ℃ ℃-3.3 ˚C 6 Heat generated or gained-(mass of liquid, g x Data line 5, x 4.18, J/g ) ℃ ℃ 275.88 J 7 Molar Heat of Solution (Data line 6, J ÷ Data line 2, mol) 14,800. J/mole Data Table: Sodium Carbonate Data Item Value 1 Mass of sodium carbonate used 1.00g 2 Moles of sodium carbonate used .0094 mol 3 Starting temperature of water 20.1 ˚C 4 Ending temperature of water 21.2 ˚C 5 Change in temperature (Data line 4, - Data line 3, ) ℃ ℃ 1.1 ˚C 6 Heat generated or gained-(mass of liquid, g x Data line 5, x 4.18, J/g ) ℃ ℃ 91.96 J 7 Molar Heat of Solution (Data line 6, J ÷ Data line 2, mol) 9,780. J/mole...
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