記憶度
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問題一覧
1
Which is not true about lecithin?
has low boiling point
2
What test is specific for lecithin solution and coconut oil?
grease spot test
3
As an emulsifying agent, the non-polar portion of lipids is being attracted to the non-polar molecules in a solution while the polar hydrocarbon portion is attracted to the polar water molecules in the solution.
False
4
Solvents with very low pH can dissolve lipids.
True
5
The test that make oil and water mixed.
Emulsification Test
6
In which solvent will coconut oil form a temporary emulsion?
water
7
Emulsification Test is a test for the chemical property of lipids.
False
8
Lipids are soluble in non-polar organic solvents.
True
9
Which gives a positive result to the Grease Spot test?
lecithin solution
10
Which lipid sample has the greatest amount of saturated fatty acid?
butter
11
In which solvent are the lipids completely insoluble?
distilled water
12
Emulsification is a chemical change occurring among lipids.
False
13
What is the best solvent for lecithin?
ether
14
Which does not affect the solubility of lipids?
pH of the lipids
15
What test is specific for bile acids and lecithin?
emulsification test
16
The Grease Spot test is specific for what kind of lipids?
lipids with fatty acids
17
What lipids is contained in the digestive fluid of the liver that helps in the digestion of fats?
bile acids
18
The relative amount of carbon, hydrogen, oxygen, nitrogen and phosphorus and the structural position of these elements in lipids determine the degree of solubility of lipids in different solvents.
True
19
The longer the hydrocarbon chain of lipids, the more insoluble it is in polar solvents.
True
20
Why didn't acetone give a positive result in the Grease Spot Test?
it does not contain fatty acids