Intermolecular Forces Post-Lecture Flashcard

Front

What are intermolecular forces (IMFs)?

Back

Intermolecular forces (IMFs) are forces of attraction or repulsion between neighboring particles (molecules, atoms, or ions) that influence the physical properties of substances.

Front

What is the only intermolecular force present between two nonpolar molecules?

Back

London dispersion forces (LDF) are the only intermolecular force present between two nonpolar molecules.

Front

What type of molecules have permanent dipoles?

Back

Polar molecules have permanent dipoles due to the uneven distribution of electron density.

Front

What is the role of intermolecular forces in liquids and solids?

Back

Intermolecular forces control the properties of liquids and solids, such as boiling point, melting point, and viscosity.

Front

Which intermolecular force occurs between all polar molecules?

Back

Dipole-Dipole interactions (DD) occur between all polar molecules.

Front

What is required for hydrogen bonding to occur?

Back

For hydrogen bonding to occur, one polar molecule must have a hydrogen atom covalently bonded to an oxygen, nitrogen, or fluorine atom, and the other must have an oxygen, nitrogen, or fluorine atom.

Front

What are London dispersion forces (LDF)?

Back

London dispersion forces (LDF) are weak intermolecular forces that arise from temporary dipoles in molecules, occurring in all types of molecules but are the only forces in nonpolar molecules.

Front

How do dipole-dipole interactions differ from hydrogen bonds?

Back

Dipole-dipole interactions occur between polar molecules, while hydrogen bonds are a specific, stronger type of dipole-dipole interaction involving hydrogen bonded to highly electronegative atoms (O, N, F).

Front

What factors affect the strength of intermolecular forces?

Back

The strength of intermolecular forces is affected by molecular size, shape, polarity, and the presence of functional groups.

Front

What is the significance of hydrogen bonds in biological systems?

Back

Hydrogen bonds are crucial in biological systems, influencing the structure and properties of water, proteins, and nucleic acids (DNA).