Multiple Choice
Which of the following statements is true regarding the relationship between intermolecular forces and boiling point?
13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces and Physical Properties
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Which molecules would most likely cause a liquid to have the lowest viscosity?
A
Large, polar molecules
B
Small, nonpolar molecules
C
Small, polar molecules
D
Large, nonpolar molecules
Verified step by step guidance1
Understand the concept of viscosity: Viscosity is a measure of a fluid's resistance to flow. It is influenced by the size and shape of molecules, as well as the intermolecular forces between them.
Consider the effect of molecular size: Larger molecules tend to have higher viscosity because they have more surface area for intermolecular interactions, which can hinder their movement.
Evaluate the role of polarity: Polar molecules have stronger intermolecular forces, such as hydrogen bonding or dipole-dipole interactions, which can increase viscosity by making it harder for molecules to slide past each other.
Identify the characteristics of nonpolar molecules: Nonpolar molecules have weaker intermolecular forces, such as London dispersion forces, which generally result in lower viscosity compared to polar molecules.
Determine the combination that results in the lowest viscosity: Small, nonpolar molecules are likely to cause a liquid to have the lowest viscosity because they have minimal intermolecular forces and less surface area for interactions, allowing them to flow more easily.
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