Problem: Which molecules would most likely cause a liquid to have the lowest viscosity?large, polar moleculessmall, nonpolar moleculessmall, polar moleculeslarge, nonpolar molecules

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We’re being asked to determine which compound will have the lowest viscosity


Recall that there are several types of intermolecular forces:

1. Ion-dipole interaction – occurs between an ion and a polar covalent compound

2. Hydrogen bonding – occurs in compounds where hydrogen is directly connected to an electronegative element such as N, O, or F

3. Dipole-dipole interaction – occurs between two polar covalent compounds

4. Induced-dipole interaction – occurs when a nonpolar compound interacts with a polar compound

5. Dispersion forces – occurs in all compounds. This is the primary intermolecular force exhibited by nonpolar compounds.


Compounds with strong intermolecular forces the higher the greatest viscosity. This is because they require more energy to be able to break the bonds during the phase transition.

 

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Problem Details

Which molecules would most likely cause a liquid to have the lowest viscosity?


large, polar molecules
small, nonpolar molecules
small, polar molecules
large, nonpolar molecules

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