14-15) Comparing Solutions, Colloids and Suspensions. Comparing polar and nonpolar compounds.

Soultions- are homogenous mixtures of components that may be gases, liquids, or solids. The substance present in the greatest amount is called the solvent. Solvents are usually liquids. Substances present in smaller amounts are called solutes. An example would be saline solution (table salt and water).
Colloids- are heterogeneous mixtures that often appear translucent or milky. The solute particles are larger than those in true solutions, they do not settle out. They do scatter light, and so the path of a light beam shining through a colloidal mixture is visible. An example would be milk.
Suspensions- are heterogeneous mixtures with large, often visible solutes that tend to settle out. An example would be sand with water.

In covalent bonds, the shared electrons are shared equally between the atoms of the molecules. The molecules formed are electrically balanced and are called NONPOLAR MOLECULES. Nonpolar molecules do not have separate + and - poles of charge. This is not always the case. When covalent bonds are formed, the resulting molecule always has a specific three-dimensional shape, with the bonds formed at definite angles. A molecule's shape helps determine what other molecules or atoms it can interact with; it may also result in unequal electron pair sharing and POLAR MOLECULES. Polar molecules have separate + and - poles of charge. This is especially true in nonsymetrical molecules that have atoms with different electron-attracting abilities.