BIOCHEMISTRY
POLAR AND NONPOLAR MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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vinegar
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noble gases
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Detailed explanation-1: -Vinegar exhibits three types of intermolecular forces: London dispersion forces, Dipole-Dipole forces and Hydrogen bonding. Hydrochloric acid exhibits the Dipole-Dipole forces that have been enhanced by London dispersion forces. Strong hydrogen bonds are found between water molecules.
Detailed explanation-2: -Hydrogen Bonds. Molecules with hydrogen atoms bonded to electronegative atoms such as O, N, and F (and to a much lesser extent, Cl and S) tend to exhibit unusually strong intermolecular interactions.
Detailed explanation-3: -Water has extensive hydrogen bonding between its molecules and thus the intermolecular force is stronger and so evaporation rate is slower than vinegar.
Detailed explanation-4: -If the molecules have similar molar masses and similar types of intermolecular forces, look for the one that is the most polar or that has the most electronegative atoms or the most hydrogen bonding groups. That one will have the strongest IMF’s overall.