Final answer:
Nonpolar molecules are symmetric and have their bond polarities cancel out. Examples include CO2, BF3, and CCl4, which have polar bonds but are nonpolar overall due to their geometry.
Step-by-step explanation:
Nonpolar molecules are those in which the polarity vectors of individual bonds cancel out, due to the symmetric arrangement of the molecule. A classic example is carbon dioxide (CO2), which has polar bonds but is a nonpolar molecule overall because of its linear symmetric shape. Other nonpolar molecule examples based on molecular geometry include boron trifluoride (BF3) and carbon tetrachloride (CCl4). It's important to understand that in order to determine if a molecule is nonpolar, one must have a good grasp of Lewis structures and VSEPR theory to visualize the molecular geometry. Nonpolar molecules do not have an affinity toward charged particles, as indicated by the term 'paraffins', and they primarily interact through London dispersion forces, which are present in all molecules.