(b) Which type of intermolecular attractive force operates only between polar molecules?

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Identify the types of intermolecular forces: London dispersion forces, dipole-dipole interactions, hydrogen bonding, and ion-dipole interactions.

Understand that polar molecules have a permanent dipole moment due to the difference in electronegativity between atoms.

Recognize that dipole-dipole interactions occur between the positive end of one polar molecule and the negative end of another polar molecule.

Note that dipole-dipole interactions are specific to polar molecules because they rely on the presence of a permanent dipole.

Conclude that the type of intermolecular attractive force that operates only between polar molecules is dipole-dipole interactions.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Intermolecular Forces

Intermolecular forces are the attractive forces that occur between molecules, influencing their physical properties such as boiling and melting points. These forces are weaker than covalent or ionic bonds and include various types such as hydrogen bonding, dipole-dipole interactions, and London dispersion forces.

Polar Molecules

Polar molecules have an uneven distribution of electron density, resulting in a partial positive charge on one end and a partial negative charge on the other. This polarity arises from differences in electronegativity between atoms, leading to dipole moments that affect how these molecules interact with each other.

Dipole-Dipole Interactions

Dipole-dipole interactions are a type of intermolecular force that occurs specifically between polar molecules. These forces arise from the attraction between the positive end of one polar molecule and the negative end of another, contributing to the overall stability and properties of polar substances.

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Textbook Question

Benzoic acid, C₆H₅COOH, melts at 122 °C. The density in the liquid state at 130 °C is 1.08 g/cm³. The density of solid benzoic acid at 15 °C is 1.266 g/cm³. (b) If you converted a cubic centimeter of liquid benzoic acid into a solid, would the solid take up more, or less, volume than the original cubic centimeter of liquid?

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Textbook Question

(a) Which type of intermolecular attractive force operates between all molecules?

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Textbook Question

(c) Which type of intermolecular attractive force operates only between the hydrogen atom of a polar bond and a nearby small electronegative atom?

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Textbook Question

(b) Which of these kinds of interactions are broken when a liquid is converted to a gas?

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