Unit 3 Bonding Review

Front

What is a lone pair of electrons?

Back

A lone pair of electrons refers to a pair of valence electrons that are not shared with another atom and are localized on a single atom.

Front

How many lone pairs are present in a trigonal pyramid molecular shape?

Back

1

Front

What is the formal charge of an atom?

Back

The formal charge of an atom is the charge assigned to it based on the difference between the number of valence electrons it has and the number of electrons it owns in a Lewis structure.

Front

What is the formal charge on carbon in a neutral molecule?

Back

0

Front

What determines if a molecule is polar or non-polar?

Back

A molecule is polar if it has a net dipole moment due to the presence of polar bonds and an asymmetrical shape; it is non-polar if the dipoles cancel out due to symmetry.

Front

Is a molecule with symmetrical shape always non-polar?

Back

Yes, a molecule with a symmetrical shape is typically non-polar because the dipoles cancel each other out.

Front

What is the shape of a molecule with two bonded atoms and one lone pair on the central atom?

Back

Bent.

Front

What are the shapes that have unshared pairs of electrons on the central atom?

Back

Bent and Pyramidal.

Front

What is the significance of lone pairs in molecular geometry?

Back

Lone pairs affect the shape of the molecule by repelling bonded pairs, which can alter bond angles and overall geometry.

Front

What is the bond angle in a trigonal pyramidal molecule?

Back

Approximately 107 degrees.