tempprobes - University of Florida Chemistry Outreach...

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University of Florida Chemistry Outreach Program Temperature of Reactions Estimated time: 50 mins. + 10 mins. clean-up Topics: Endothermic vs. exothermic reactions, Graphing, Temperature probes, SC.A.1.3 Introduction: Exothermic and endothermic are terms that describe the change of heat during a reaction. Exothermic reactions release heat because the energy of the system has dropped, so the excess energy is left as heat. This will cause a steady increase in temperature in the beginning of the reaction until most the reactants have reacted. Endothermic implies heat is taken in by the reaction because the energy of the system has increased. This will create a steady drop in temperature. Objective: This experiment uses computerized temperature probes to graph temperature changes in a reaction over time. Baking soda and citric acid demonstrate temperature decreasing during an endothermic reaction while baking soda and calcium chloride in water is an exothermic reaction that releases heat. The graphs show the linear relationship of heat energy changing in exothermic and endothermic reactions over time. Students get to explore the concept of energy needed to break bonds and energy released when new chemical bonds form. They can experiment themselves using isopropanol and water to get a cold solution. Materials:
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tempprobes - University of Florida Chemistry Outreach...

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