CHem lab write up heating and cooling curves

CHem lab write up heating and cooling curves - Heating and...

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Heating and Cooling Curves Abbey Blair Period 5 10/25/15 In this lab me and my partner examined what happens when a pure substance undergoes a change in physical state. We used phenyl salicylate and we had to determine if the liquid phenyl salicylate freezes at the same temperature that it melts in its solid state. In this lab we wore safety goggles. The procedure is on page 13 of the lab manual. Data: Time Temperature (degrees celcius) (Seconds) Cooling (Part 1) Heating (Part 2) 0 51.2 25.0 20 40.1 37.1 40 32.8 44.9 60 40.0 47.8 80 40.9 48.6 100 40.9 49.4 120 41.1 50.9 140 41.2 52.2 180 41.2 55.4 200 41.2 55.8 220 41.3 55.7 240 41.2 55.3 260 41.1 280 40.9 300 40.0 320 38.1 340 37.4
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360 35.4 380 33.2 420 32.1 440 30.5 Questions: 1. The melting point of phenyl salicylate is 40.0 degrees Celsius, and the freezing point is the same.
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Unformatted text preview: 2. The po±ental energy increases and ±he kinetc energy remains cons±an±. 3. No, i± would stll look ±he same because ±he meltng and freezing poin± of a subs±ance don’± change. 4. A) Meltng: Endo±hermic B) Freezing: Exo±hermic C) Sublimaton: Endo±hermic D) Condensaton: Exo±hermic E) Depositon: Exo±hermic F) Evaporaton: Endo±hermic 5. In ±he gaseous phase, a subs±ance’s partcles have ±he grea±es± kinetc energy. Additonal Exercises: 1. Answer #3 2. Answer #1 3. Answer #3 4. Answer #2 5. Answer #1 6. Answer #3 7. Answer #2 8. Answer #1 9. Answer #2 10. Answer #1 11. Answer #2 12. Answer #3 Conclusion: In this lab I learned the diferent heaTng and cooling points oF the substance phenyl salicylate and the diference between potenTal energy and kineTc energy....
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  • Fall '13
  • DeWolfe
  • Phenyl Salicylate, Abbey Blair, liquid phenyl salicylate

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