Cooling Water Lab

Cooling Water Lab Background: 1. Temperature is a measure of molecular motion; the average kinetic energy of the particles. 2. Heat is a form of energy that flows from a system at a higher temperature to a system at a lower temperature; the total kinetic energy of the particles. Hypothesis: If two beakers containing different amounts of hot water are placed into an ice bath, then the one containing ________ (more or less) water will cool down more quickly. Materials: 2 Beakers Ice Hot Water 2 Thermometers Graph Paper Procedure: 1.Copy the data table onto your paper. 2. With stopper in place, fill basin (sink at lab table) about half full of ice. 3. Place one beaker containing 400 ml of hot water and one beaker containing 100 ml of hot water into the ice bath. 4. Record the temperature of each beaker every two minutes for twenty minutes. 5. Construct line graphs of your data. Time will be on the X axis and temperature on the Y axis. Data Table: Analysis and Conclusion Questions: 1. W hat was your hypothesis? 2. Was your hypothesis supported by your data? . What is temperature? 4. What is heat? 5. Which beaker contained more heat energy? 6. How are heat and temperature different? 7. How would the amount of energy absorbed by melting 10 grams of ice compare with the energy released by freezing 10 grams of water? 8. If you mixed 20. 0 ml of 20. 0 oC water with 20. 0 ml of 60. 0 oC water, what would be the final temperature of the mixture? 9. If you mixed 10. 0 ml of 20. 0 oC water with 30. 0 ml of 60. 0 oC water, what would be the final temperature of the mixture? 10.Draw pictures of a teacup and a bathtub both filled with water at the same temperature (show relative particle movement). Which contains more heat? 11. A candle and a bonfire both burn at about the same temperature. Compare the heat content of each. Some material adapted from ChemSource: Instructional Resources for Preservice and Inservice Chemistry Teachers. KEY Analysis and Conclusion Questions: 1. W hat was your hypothesis? Answers will vary. 2. Was your hypothesis supported by your data? Answers will vary. 3. What is temperature? easure of the average kinetic energy of the particles in a sample of matter 4. What is heat? measure of the total kinetic energy of the particles in a sample of matter 5. Which beaker contained more heat energy? The beaker containing 400 ml. 6. How are heat and temperature different?7. How would the amount of energy absorbed by melting 10 grams of ice compare with the energy released by freezing 10 grams of water? It would be the same. 8. If you mixed 20. 0 ml of 20. 0 oC water with 20. 0 ml of 60. 0 oC water, what would be the final temperature of the mixture? 0. 0 oC 9. If you mixed 10. 0 ml of 20. 0 oC water with 30. 0 ml of 60. 0 oC water, what would be the final temperature of the mixture? 50. 0 oC 10. Draw pictures of a teacup and a bathtub both filled with water at the same temperature (show relative particle movement). Which contains more heat ? Pictures; the bathtub. 11. A candle and a bonfire both burn at about the same temperature. Compare the heat content of each. Bonfire has more heat. Temperature (oC) Time (minutes) Beaker with 400 ml water Beaker with 100 ml water 0 2 4 6 20