CELL STRUCTURES AND FUNCTION
BIO MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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nonpolar fats and oils
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polar sugar molecules
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salt made of a positive sodium ion and a negative chloride ion
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all of the substances will dissolve easily in water
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Detailed explanation-1: -The answer is c) hexane. Hexane is a nonpolar molecule while is water is a polar molecule. Hence, the two is expected to be insoluble.
Detailed explanation-2: -Answer and Explanation: Water is a polar molecule, and the least polar option is the least likely to dissolve in water. Salt is quite polar.
Detailed explanation-3: -Nonpolar substances do not dissolve in polar solvents which explains why oil does not dissolve or mix with water. Nonpolar substances will dissolve in nonpolar solvents. To dissolve the oil stain described in this question a nonpolar solvent such as hexane or carbon tetrachloride could be used.
Detailed explanation-4: -Some kinds of molecules, like oils and fats, are nonpolar. These nonpolar molecules have no charge, and so water is not very attracted to them. Molecules of nonpolar compounds, such as oil and gasoline, even when mixed well into water, tend to separate from the water when the mixing stops.
Detailed explanation-5: -These molecules don’t have regions of partial positive or partial negative charge, so they aren’t electrostatically attracted to water molecules. Thus, rather than dissolving, nonpolar substances (such as oils) stay separate and form layers or droplets when added to water.