Practice Unit 3 (3.7)

Front

What is a lone pair in a molecule?

Back

A lone pair refers to a pair of valence electrons that are not shared with another atom and are not involved in bonding.

Front

How many lone pairs are in a molecule with the formula H2O?

Back

2

Front

What does VSEPR stand for?

Back

Valence Shell Electron Pair Repulsion.

Front

What is the purpose of VSEPR theory?

Back

To predict the molecular shape based on the repulsion between electron pairs.

Front

Define polar molecule.

Back

A polar molecule is one that has a net dipole moment due to the presence of polar bonds, resulting in a molecule with a positive and a negative end.

Front

Define nonpolar molecule.

Back

A nonpolar molecule is one that does not have a net dipole moment, often due to symmetrical distribution of charge.

Front

What is electronegativity?

Back

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

Front

How does electronegativity affect molecular polarity?

Back

Differences in electronegativity between atoms in a molecule can lead to unequal sharing of electrons, resulting in polarity.

Front

What is the molecular shape of a molecule with 2 lone pairs and 2 bonded pairs?

Back

Bent or angular.

Front

What type of molecule is CCl4?

Back

CCl4 is a nonpolar molecule.