Chemical Structures and Interactions

These flashcards cover key concepts related to chemical structures, bond types, polarity, and noncovalent interactions as discussed in the lecture.

Methane (CH4)

A molecule with 4 hydrogens attached to a carbon, where electrons prefer to be as far apart as possible.

Central Atom Bonds and Lone Pairs

Knowing the number of bonds and lone pairs on the central atom helps determine the molecule's structure.

Polar Molecule

A molecule with one side having a partial positive charge (δ+) and another side with a partial negative charge (δ-), leading to concentrated electrons.

Nonpolar Bonds

If a molecule contains only nonpolar bonds, it is always nonpolar.

Covalent Bonds and Polarity

For a molecule to be polar, it must have at least one polar bond. Not all molecules with polar covalent bonds are polar.

Noncovalent Interactions

Interactions that do not involve the sharing of valence electrons; influenced by shape, atomic make-up, and charges.

Hydrogen Bonding

An interaction between a nitrogen (N), oxygen (O), or fluorine (F) atom and a hydrogen atom that is covalently bonded to another N, O, or F.

Dipole-Dipole Interactions

The attraction of neighboring polar groups to one another.

London Forces

Attractions between nonpolar molecules (or nonpolar portions of a molecule) due to temporary partial charges; stronger with greater surface area.

Hydrogen Bonding Capability

The ability of a compound to engage in hydrogen bonding, significantly affecting the interactions between molecules.