Which of the following statements correctly describes a polar molecule?

• A. It has two regions with opposite partial charges, one positive and one negative.
• B. It contains only nonpolar covalent bonds.
• C. It has two regions with a slight positive charge.
• D. It has no separation of charge across the molecule.

Answer: (A)

Verified step by step guidance

1. Understand that a polar molecule has an uneven distribution of electron density, leading to regions with partial positive and partial negative charges.
2. Recall that polarity arises when there is a difference in electronegativity between atoms in a bond, causing dipoles (partial charges) to form.
3. Recognize that a polar molecule must have at least two regions with opposite partial charges (one positive and one negative) to create a dipole moment.
4. Note that molecules with only nonpolar covalent bonds or no separation of charge do not have these distinct regions and are therefore nonpolar.
5. Conclude that the correct description of a polar molecule is one that has two regions with opposite partial charges, one positive and one negative.