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)
Chemical Principles in the Laboratory
11th Edition
ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Chapter42: Rate Studies On The Decomposition Of Aspirin
Section: Chapter Questions
Problem 1ASA
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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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