Those at increased risk include: 1  People with diabetes. 2  People with high blood pressure. 3  People with a family history of kidney failure. 4  People who are 65 years or older. 5  Certain ethnic groups including African Americans, Hispanics, Asians, American Indians.
The dipole moment of a molecule can be predicted by looking at the molecule's structure and the location of the dipoles within the molecule. When a molecule has no dipole moment, it will be nonpolar. A molecule with a dipole moment will be polar.
However, if the molecule is asymmetric, the bond dipole moments won't cancel out and the molecule will have a net dipole moment and the molecule is therefore polar. To really understand how to do this, the Lewis structure is only the first step. You need to consider the molecule in 3D (three dimensions). If you click on the example molecules (where it says 3D view) below you'll get a better understanding of why some molecules are polar and some not.