Page 3- Measuring Energy Changes Pre-Lab Questions A sample of lauric acid-an organic compound used to make soap-was heated above its melting point in a test tube and then cooled in a bath of water until it solidified. The temperature of the lauric acid was measured as a function of time and the following graph was recorded. 70- 60- 50- 40 30 20- 0 2 4 6 8 10 12 Time (min) 1. What is the physical significance of the flat region (plateau) on the curve? 2. Use the graph to estimate the melting point of lauric acid. 3. Is heat being absorbed or released by the lauric acid sample as it solidifies? Materials Beakers, 400-mL, 2 Digital thermonmeter Temperature (°C)
Page 3- Measuring Energy Changes Pre-Lab Questions A sample of lauric acid-an organic compound used to make soap-was heated above its melting point in a test tube and then cooled in a bath of water until it solidified. The temperature of the lauric acid was measured as a function of time and the following graph was recorded. 70- 60- 50- 40 30 20- 0 2 4 6 8 10 12 Time (min) 1. What is the physical significance of the flat region (plateau) on the curve? 2. Use the graph to estimate the melting point of lauric acid. 3. Is heat being absorbed or released by the lauric acid sample as it solidifies? Materials Beakers, 400-mL, 2 Digital thermonmeter Temperature (°C)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter6: Thermochemisty
Section: Chapter Questions
Problem 6.134QP
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Answer the following pre
Transcribed Image Text:Page 3- Measuring Energy Changes
Pre-Lab Questions
A sample of lauric acid-an organic compound used to make soap-was heated above its
melting point in a test tube and then cooled in a bath of water until it solidified. The
temperature of the lauric acid was measured as a function of time and the following graph
was recorded.
70-
60-
50-
40
30
20-
0 2 4 6 8 10 12
Time (min)
1. What is the physical significance of the flat region (plateau) on the curve?
2. Use the graph to estimate the melting point of lauric acid.
3. Is heat being absorbed or released by the lauric acid sample as it solidifies?
Materials
Beakers, 400-mL, 2
Digital thermonmeter
Temperature (°C)
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