Exothermic+Heat+Pack+Reactions

1.2.3.media type="file" key="paul and harry.mp3" 1. This is the calorimeter set up that we used for the reaction of all of our substances. We always placed the calorimeter on the stirring machine to help the soluction mix. 2. This is a smaller beaker full of the sodium thiosulfate solution within a larger beaker filled with cold water to help cool it back to room tmperature. 3. This is the cup that goes inside of the calorimeter filled with water with the sodium thiosulfate in a beaker next to it.

**HEAT PACK REACTION. Paul Nerland and Harry Whitaker. **Exothermic reactions were used to observe the amount of heat yielded by various substances. CaCl2, Sodium thiosulfate, and magnesium sulfate were added to water in separate reactions. The reaction of magnesium sulfate and water produced adequate results as the temperatures went up slightly above room temperature and cooled in 2-3 minutes. The sodium thiosulfate showed qualities of a heat pack when heated as it took more than 2 hours to completely cool to room temperature. When the reaction in calorimeter took place, no major changes of temperature occurred and results proved inconclusive. The reaction of calcium chloride and water yielded the most heat and lasted the longest out of the 3 reactions. Heat packs require temperatures to heat up quickly over room temperature and cool very slowly; the calcium chloride reaction had both of these properties and thus can be concluded most ideal for a heat pack.
 * Key Words: heat pack, chemistry, sodium thiosulfate, calcium chloride, water, magnesium sulfate, calorimeter, heating, temperature **