Lab 4- Distinguishing Between Endothermic and Exothermic Reactions.docx - Cortney Stetson Chemistry 101-701 Lab 4 Distinguishing Between Endothermic and

Lab 4- Distinguishing Between Endothermic and Exothermic Reactions.docx

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Cortney Stetson Chemistry 101-701 Lab 4: Distinguishing Between Endothermic and Exothermic Reactions October 1 st , 2018 Experiment 2: Cold Packs vs. Hand Warmers In this experiment you will observe the temperature changes for cold packs and hand warmers. Since temperature is defined as the average kinetic energy of the molecules, changes in temperature indicate changes in energy. You will use a Styrofoam™ cup as a calorimeter to capture the energy. The customary lid will not be placed on the cup since ample oxygen from the air is needed for the hand warmer ingredients to react within a reasonable amount of time. Procedure Part 1: Cold Pack 1. Measure 10 mL of distilled water in a 10 mL graduated cylinder. 2. Using your scissors, cut off the top of your Cold Pack and weigh out 10 g of the ammonium nitrate crystals found in the inner contents of the cold pack. Then place the ammonium nitrate crystals into a Styrofoam™ cup. (One Styrofoam™ cup will be used as a calorimeter for the cold pack and the other Styrofoam™ cup will be used as a calorimeter for the hot pack).

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