 Probably the main occupation of a chemist is to actually run a chemical reaction to produce a specific compound. They need to observe reactions and they need to determine the reactants and products of a reaction. In this chapter you will learn the difference between a biological mole and a chemical mole of zinc. You will learn to predict the products of the reaction of potassium with water and predict the products of the combustion of methanol. You will have to wait until later in this chapter to see the famous gummy bear reaction.