Unit 3 Exam Review Prep

Front

What is a polar molecule?

Back

A polar molecule is a molecule that has a net dipole moment due to the presence of polar bonds, which arise from differences in electronegativity between atoms.

Front

What is a non-polar molecule?

Back

A non-polar molecule is a molecule that does not have a net dipole moment, often because the atoms bonded to the central atom are the same or symmetrically arranged.

Front

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

Back

The shape of the molecule and the electronegativity of the atoms involved determine if a molecule is polar or non-polar.

Front

What are lone pairs in a molecule?

Back

Lone pairs are pairs of valence electrons that are not shared with another atom and are not involved in bonding.

Front

How many lone pairs does NH3 (ammonia) have?

Back

NH3 has 1 lone pair.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds.

Front

How many valence electrons does Silicon (Si) have?

Back

Silicon has 4 valence electrons.

Front

What is a cation?

Back

A cation is a positively charged ion that is formed when an atom loses one or more electrons.

Front

How is the cation Fe3+ formed?

Back

The cation Fe3+ is formed when an atom of iron loses three electrons.

Front

What is electronegativity?

Back

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