AP BIOLOGY

Detailed explanation-1: -SiO2 has a linear shape, and since the elements at each end are the same, the pull is canceled out, making the overall compound non-polar.

Detailed explanation-2: -SiO2 is a non-polar compound because of its linear and symmetrical shape. The bonds in the molecule are polar because the oxygen atom is more electronegative than the silicon atom but due to linear and opposite directions of both bonds, the dipoles of both bonds in SiO2 cancel out each other.

Detailed explanation-3: -Solid sulfur dioxide is a polar molecular solid because the net dipole moment is non zero and constituent particles are molecules. The electronegativity of sulfur is 2.5 and that of oxygen is 3.5. Therefore, the sulfur-oxygen bonds are polar.