Polar vs nonpolar

Front

What is a polar molecule?

Back

A polar molecule is one that has a net dipole moment due to the presence of polar bonds, which arise from differences in electronegativity between atoms, resulting in an uneven distribution of electron density.

Front

What is a nonpolar molecule?

Back

A nonpolar molecule is one that does not have a net dipole moment, meaning the electron density is evenly distributed, often due to symmetrical arrangements of atoms or bonds.

Front

What determines if a molecule is polar or nonpolar?

Back

The polarity of a molecule is determined by the shape of the molecule and the difference in electronegativity between the atoms involved in the bonds.

Front

Give an example of a polar molecule.

Back

Water (H2O) is a common example of a polar molecule due to its bent shape and the difference in electronegativity between hydrogen and oxygen.

Front

Give an example of a nonpolar molecule.

Back

Methane (CH4) is an example of a nonpolar molecule because of its symmetrical tetrahedral shape, which allows for even distribution of electron density.

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

When two atoms in a bond have different electronegativities, the atom with the higher electronegativity attracts the shared electrons more strongly, creating a polar bond.

Front

What is a dipole moment?

Back

A dipole moment is a measure of the separation of positive and negative charges in a molecule, indicating the polarity of the molecule.

Front

What is the significance of molecular shape in determining polarity?

Back

The shape of a molecule affects how the dipoles from individual bonds add up; if they cancel out, the molecule is nonpolar, while if they do not, the molecule is polar.

Front

What is a symmetrical molecule?

Back

A symmetrical molecule is one where the arrangement of atoms is uniform, leading to an even distribution of charge and typically resulting in a nonpolar molecule.