Why do the non-polar tails of the fatty acid molecules project into the air abov
ID: 575385 • Letter: W
Question
Why do the non-polar tails of the fatty acid molecules project into the air above the water surface? Choose all that apply.
Steric acid is completely polar and will dissolve readily in the water layer.
The nonpolar tails of the steric acid molecule are attracted to the nonpolar molecules in the air
Hydrophobic forces causes the nonpolar ends of the steric acid molecule to orient away from the polar water.
The fatty acid molecules do not project into the air, but are dissolved by the water layer.
Water is attracted to the fatty acid tail of the steric acid molecule and repels the polar head group.
A.Steric acid is completely polar and will dissolve readily in the water layer.
B.The nonpolar tails of the steric acid molecule are attracted to the nonpolar molecules in the air
C.Hydrophobic forces causes the nonpolar ends of the steric acid molecule to orient away from the polar water.
D.The fatty acid molecules do not project into the air, but are dissolved by the water layer.
E.Water is attracted to the fatty acid tail of the steric acid molecule and repels the polar head group.
Explanation / Answer
Ans : B) The nonpolar tails of the steric acid molecule are attracted to the nonpolar molecules in the air.
C) Hydrophobic forces causes the nonpolar ends of the stearic acid molecule to orient away from the polar water.
The fatty acid molecules have a polar head and a nonpolar tail. The polar head gets itself attracted to the polar water molecules and the non polar tails orient themselves opposite to it , towards the very nonpolar air, according to the general rule of "like attracts like".
This is the reason why the fatty acid molecules form micelles in water.
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