Lab 19- Thermal Energy Associated with Chemical and Physical Changes

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Experiment 19 Part A 1. Press ON/OFF button 2. Press MAIN MENU F2 F1 3. Make and ice bath in a 150 mL beaker 4. Press CALIBRATE enter 0.0C when promted press ENTER insert temperature probe and swirl it around until the screen reads 0.0C press ENTER 5. Remove temperature probe 6. Press SETUP F1 a. Set max temperature to 70-75C b. Set min temperature to 15-18C c. Time should range from 0-250 seconds 7. Press DISPLAY to accept all values 8. Heat up 200mL of water in a microwave for about two minutes 9. Place hot water on a hot plate to keep warm 10. Nest one Styrofoam cup in another 11. Obtain an exact mass of tap water (45-50g) to serve as cold water 12. Put a magnetic stirrer in the bottom of the calorimeter 13. Secure temperature probe to a ring stand 14. Place temperature probe through hole in cardboard lid and position probe about 1cm above bottom of calorimeter 15. Obtain an exact mass of hot water (~50mL) d. Should be approx. 45-60C above room temperature 16. Record temperature of cold water and hot water immediately before mixing the two. 17. Press START and turn on the stir bar. 18. After 10 seconds have elapsed, add hot water sample 19. Press STOP when the thermograph stabilizes 20. Save that shizzzznit 21. Press DISPLAY to clear previous scan 22. Repeat 11-19 for a second trial | Trial One | Trial Two | Mass of cold water | | | Initial temperature of cold water | | | Mass of hot water | | | Initial temperature of hot water | | | Final Temperature | | | File Name | | | Part B 1. Nest two Styrofoam cups within one another 2. Turn on magnetic stirrer 3. Insert probe into cardboard lid 4. Pour 25mL of water into calorimeter 5. Determine initial temperature of water 6. Obtain

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