Heterogeneous Mixture

In a mixture of oil and water the solute, oil is nonpolar, and water is polar and the mixture is heterogeneous. Below is a particulate level model of the mixture of oil and water. Shake the mixture and observe what happens. The polar molecule, representing water has permanent partial positive and partial negative charges. The nonpolar molecule does exhibit permanent charge, but if you look closely you will observe instantaneous dipoles forming when polar molecules are close to nonpolar molecules or nonpolar molecules are close to nonpolar molecules. 

For a particulate level view of the solution process we will look at a model developed by concord.org.