Polar Molecule description.

Polar Molecule description.

• A. Molecule with distributed charges evenly
• B. Molecule with no charge
• C. Molecule with negative charge only
• D. Molecule with partial charges (dipole)

Answer: (D)

Polar molecules have an uneven distribution of electron density, which creates partial charges at different ends of the molecule. This gives the molecule a dipole moment, with a partial positive end and a partial negative end. The key idea is that the molecule can be overall neutral yet still have this internal separation of charge, as seen in water where oxygen pulls electron density toward itself. This makes the description of a molecule with partial charges (dipole) the best choice. The other options miss this nuance: charges evenly distributed describes a nonpolar molecule, a molecule with no charge implies no partial charges at all, and a molecule with only a negative charge would be an ion rather than a polar molecule with distinct ends.

Polar molecules have an uneven distribution of electron density, which creates partial charges at different ends of the molecule. This gives the molecule a dipole moment, with a partial positive end and a partial negative end. The key idea is that the molecule can be overall neutral yet still have this internal separation of charge, as seen in water where oxygen pulls electron density toward itself.

This makes the description of a molecule with partial charges (dipole) the best choice. The other options miss this nuance: charges evenly distributed describes a nonpolar molecule, a molecule with no charge implies no partial charges at all, and a molecule with only a negative charge would be an ion rather than a polar molecule with distinct ends.