Driving Forces in Chemistry

We learned a somewhat confusing lesson in chemistry class today. Mrs. Frankenberg discussed driving forces in chemical reactions. Two components will react if there is at least one driving force present. The driving forces of chemical reactions are:
-Formation of a solid
-Formation of water
-Formation a gas
-Transfer of electrons
There is a link to a video below that explains these and indications of chemical reactions

However, we mainly focused on the formation of a solid today, which is also known as precipitate. With these, double replacement precipitation reactions take place. In a double replacement reaction, 2 compounds replace 2 compounds by having the positive ions (cations) switch with each other. The format of this reaction looks like this: 

http://socratic.org/questions/is-this-reaction-a-double-replacement-reaction-fe-c5h5-2-bf4-nab-c6f5-4-fe-c5h5-

In addition, for this type of reaction to take place, the compounds that are the reactants must be ionic and aqueous and one of the products must be a solid. We must memorize the solubility rules to check if a chemical equation has a driving force.

http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=jpg::::::/sites/dl/free/0023654666/650262/Solubility_Rules_4_02.jpg::Solubility%20rules

Driving Forces Video