2. Look at the structures and physical prop- erties of the fatty acids listed in the table above. a. Based on the information in Column 1, how many C atoms does each of these fat- ty acids have? b. Based on the information in Column 1, list the number of double bonds in each of these fatty acids. Stearic acid Oleic acid Linoleic acid Linolenic acid c. Based on the melting points listed, which of these fatty acids are solids at room temperature? Room temperature is com- monly assigned as 25 °C, so they are sol- ids at room temperature if the melting point is greater than 25 °C. What structural feature causes the de- crease in melting point for the fatty acids that are liquids? Why?

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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sets of models for this part. When you com-
REPORT: Your report should include a cov-
er sheet, prelab, data, observations, and an-
PART A. Investigating the structure of tri-
Each pair of students should sign out a model
Carbon atoms:
Structure
Common
Melting Point
double bonds
name
18:0
CH3(CH2)16COOH
Stearic acid
70 °C
18:1
CH3(CH2);CH=CH(CH2)¬COOH
Oleic acid
16°C
18:2
CH:(CH2)4(CH=CHCH2)2(CH2)6COOH Linoleic acid
-5 °C
CH3CH2(CH=CHCH2):(CH2)6COOH
Linolenic acid -11 °C
18:3
2. Look at the structures and physical prop-
erties of the fatty acids listed in the table
above.
swers to questions.
a. Based on the information in Column 1,
how
PROCEDURE:
many
C atoms does each of these fat-
ty acids have?
glycerides using molecular models
b. Based on the information in Column 1,
list the number of double bonds in each of
kit. Work in groups of four students with
these fatty acids.
plete Part A, ask your lab instructor to initial
your report to indicate that you have worked
well as a team and done the activities corred-
Stearic acid
Oleic acid
Linoleic acid
oy del eid nf
ly.
1. Construct models of glycerol and three
acetic acid molecules. Keep the two mod-
el kits separate so you can return them
both with the correct atoms and bonds at
the end of lab. Divide the work among the
members of your group.
Linolenic acid
c. Based on the melting points listed, which
of these fatty acids are solids at room
temperature? Room temperature is com-
monly assigned as 25 °C, so they are sol-
ids at room temperature if the melting
point is greater than 25 °C.
2. You will now carry out an esterification
reaction with your models as follows:
Remove the OH group from each of the
acetic acid molecules.
Remove the H from each of the three On.
groups on glycerol.
d. What structural feature causes the de-
crease in melting point for the fatty acids
that are liquids? Why?
form three molecules of water.
3. If you have access to solid fat drippings
collected from cooking beef, lamb, pork,
or bacon, bring in a small sample to use in
making soap.
glyceryl triacetate. In nature, triglye
Transcribed Image Text:sets of models for this part. When you com- REPORT: Your report should include a cov- er sheet, prelab, data, observations, and an- PART A. Investigating the structure of tri- Each pair of students should sign out a model Carbon atoms: Structure Common Melting Point double bonds name 18:0 CH3(CH2)16COOH Stearic acid 70 °C 18:1 CH3(CH2);CH=CH(CH2)¬COOH Oleic acid 16°C 18:2 CH:(CH2)4(CH=CHCH2)2(CH2)6COOH Linoleic acid -5 °C CH3CH2(CH=CHCH2):(CH2)6COOH Linolenic acid -11 °C 18:3 2. Look at the structures and physical prop- erties of the fatty acids listed in the table above. swers to questions. a. Based on the information in Column 1, how PROCEDURE: many C atoms does each of these fat- ty acids have? glycerides using molecular models b. Based on the information in Column 1, list the number of double bonds in each of kit. Work in groups of four students with these fatty acids. plete Part A, ask your lab instructor to initial your report to indicate that you have worked well as a team and done the activities corred- Stearic acid Oleic acid Linoleic acid oy del eid nf ly. 1. Construct models of glycerol and three acetic acid molecules. Keep the two mod- el kits separate so you can return them both with the correct atoms and bonds at the end of lab. Divide the work among the members of your group. Linolenic acid c. Based on the melting points listed, which of these fatty acids are solids at room temperature? Room temperature is com- monly assigned as 25 °C, so they are sol- ids at room temperature if the melting point is greater than 25 °C. 2. You will now carry out an esterification reaction with your models as follows: Remove the OH group from each of the acetic acid molecules. Remove the H from each of the three On. groups on glycerol. d. What structural feature causes the de- crease in melting point for the fatty acids that are liquids? Why? form three molecules of water. 3. If you have access to solid fat drippings collected from cooking beef, lamb, pork, or bacon, bring in a small sample to use in making soap. glyceryl triacetate. In nature, triglye
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