Calorimetry 2: Hot and Cold Reactions Overview Getting Started Techniques Procedure FAQ Full Lab Manual Introduction & Goals Chemistry & Background Key Questions Prelab Problems Safety Procedure In Your Write-up Experiments Index ChemLab Home		Applets Periodic Table Applet You can calculate the formula weight of the salts used in lab this week with the molecular mass calculator in the periodic table applet. Linear Least Squares Applet This applet will fit temperature vs. time data to a straight line, allowing you to determine a more accurate value of the final temperature. Technique Links Calorimetry Goals Your goal for this week is to identify chemical compounds which could be used to produce a chemical "cold pack" and a chemical "hot pack" to treat sports injuries. In this experiment you will determine the heats of reaction for an exothermic and an endothermic reaction in solution and learn what factors contribute to the spontaneity of the two reactions under study. Key Questions 1. What happens to the temperature of the solution for exo- and endothermic reactions? 2. How is entropy changing in a dissolution reaction? What is the sign of S? 3. How do enthalpy and entropy contribute to G for each reaction? 4. How does thermodynamics relate to equilibrium? Is my reaction at equilibrium?
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