An unsaturated lipid a. is more difficult to digest than a saturate lipid, b. ha

Question

An unsaturated lipid a. is more difficult to digest than a saturate lipid, b. has a lower melting point, than a satirated lipid. c. spoils less easily than a saturated lipid, d. is more soluble in polar solvents than a saturated lipid, 2. The acrolein test for a lipid is a. based entirely on the fact that lipids can be saponified. b. based upon the fact that certain lipids, upon heating, form glycerol, which is easily dehydrated. c. applicable to nonsaponifiable lipids as well as saponifiable lipids. d. specific for cholesterol. If a commercial lipid produced a positive Kreis test. you should a. return it to the store where you purchased it and demand a refund. b. use it regularly for cooking. c. use it as a salad dressing. d. classify it as a nonsaponifiable lipid. Cholesterol a. is a saponifiable lipid. b. is produced in the body as a result of the hydrolysis of a saponifiable lipid. c. is produced in the body and used to make hormones. d. is the principal component of kidney stones. If a lipid is heated with KHSO_4 and acrolein is not produced, the lipid is probably a. unsaturated. b. saturated. c. saponifiable. d. nonsaponifiablc. 6. why is some water "hard"?

Explanation / Answer

1. option b.

2. option b. The principle behind the acrolein test is a specific chemical reaction. This reaction is utilized to determine the presence of glycerin in a fat. By heating the fat sample in the presence of potassium bisulfate (KHSO4), which acts as a dehydrating agent, acrolein (C3H4O, or CH2=CH-CHO) is formed and can easily be detected by its odor. Whenever fat is heated in the presence of a dehydrating agent, the fat molecule will shed its glycerol in the form of the unsaturated aldehyde - acrolein.

3. option a. Kreis is a colorimetric test that uses the colour produced by the action of chemical reagents as a quantitative assessment of oxidative rancidity of fats and oils.

4. Option c. cholesterol is used to produce the steroid hormones required for normal development and functioning.

5. Option d.

6.  because has high mineral content . Hard water is formed when water percolates through deposits of limestone and chalk which are largely made up of calcium and magnesium carbonates.

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