Define polar and no polar. Which tends to be hydrophobic? Hydrophilic? Explain why lipids don't mix well with water.
Polar molecules are those that are more electronegative in a certain region causing electrons to go more towards one side than another, hydrophilic. Nonpolar molecules are those that either have no polarity or the symmetrical nature of the molecule cancel out the polarity, hydrophobic molecules. Lipids don't mix well with water because they have a long fatty acid chain that is hydrophobic.