Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
![505
REAC 447: Qualitative Testing for Lipids
Post-Laboratory Questions
(Use the spaces provided for the answers and additional paper if necessary.)
Lecithin
A student used the procedure described in this
experiment to try to determine the identity of an un-
known. The lipid formed an emulsion when mixed with
oil and water, reacted with aqueous sodium hydroxide
to form soap, did not react with bromine, and gave a
positive result for the ammonium molybdate test. De-
scribe a lipid structure consistent with these results.
1. Explain what happened when you added lecithin
to the mixture of oll and water. Identify the structural
features of lecithin molecules responsible for this
result.
3.
Hbecame a cloudvorange
Solution blcitlowers,
Cholesterol. Itis not
a positive result
Cholestero!
2. Write a balanced chemical equation for the reac-
tion of bromine and triolein, a triglyceride of oleic acid,
CH3(CH2),CH=CH(CH2),COOH.
4. The structure of N-palmitoyl-D-sphingomyelin, a
sphingolipid, is shown at the bottom of this page. De-
scribe the expected results of the following tests or re-
Cs7Hio4 Ou:38r2-7057HiouD6 Bru agents on thie sphingolipid.
(1) grease-spot test
It remains the Same as room
temp 4develop sgrease-spot
(2) 5% bromine in dichloromethane
Color of th solution
decolori zes
(3) ammonium molybdate
Positive result for sphingolipid
bublole layeracolored
OH
CH-CH=CH(CH2)12CH3
CH3(CH2)14C-NH -CH
CH2-0-P-0-CH,CH2-Ň(CH3)3
Haley Doyle
416122
name
section
date](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F99edbb2b-cdb3-42ad-a421-823a7657cd58%2Fde908a64-daf9-4700-a716-e9cc7ad1279b%2Fucnzvzs_processed.jpeg&w=3840&q=75)
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