NURSING EXAM QUESTIONS
BIOCHEMISTRY
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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: -Oil doesn’t dissolve in water, i.e., it is immiscible in water. This is because its molecules are non-polar while water is a polar solvent. Non-polar substances do not dissolve in polar solvents and vice-versa.
Detailed explanation-2: -Nonpolar substances are not likely to dissolve to a significant degree in polar solvents. For example, nonpolar molecular substances, like hydrocarbons, are likely to be insoluble in water.
Detailed explanation-3: -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.
Detailed explanation-4: -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.