Get a Reaction! A chemical reaction occurs when one or more substances change to produce one or more different substances. For example, some evidence that a chemical reaction has occurred are possible changes in energy, a release of energy, the formation of a new substance, or a reduction or increase in temperature. This laboratory will be carried out with the aim of creating a chemical reaction by modifying the reaction speed of a substance. In order to change the reaction rate, a catalyst must be added, in this case the catalyst is a hydrogen ion. The iodine and propane will be mixed and then catalyzed by the hydrogen ions, thus helping to change the speed of the reaction. Some terms and ideas that will be explored in this experiment are the rate of a chemical reaction and seeing how it is affected by the concentration of the reactant(s). The concentration of the reactant is the strength of the solution. How the concentration of reactants affects the rate of reaction is commonly called the rate law. “The rate law can only be determined experimentally and can be used to predict the relationship between the rate of a reaction and the concentrations of reactants” (Holt 2006). To understand or determine the rate of this chemical process, one can make an educated guess about the reaction mechanism. “The reaction mechanism is the way in which a chemical reaction occurs, expressed in a series of chemical equations. A reaction that involves a single reactant, the rate is often proportional to the concentration of the reactant raised to a certain potency” (Holt 2006). Rate = k [reactive] n is the formula used to determine the rate law. The order of the reaction is represented by the exponent n based on the number of molecules that fit in the middle of the paper. ......each of these is used in the real world. For example, propane is used to power grills and hot air balloons; it is also used to power airsoft/paintball guns, and also in film sets to provoke. But more importantly, propane heats many homes across the United States, keeping people warm in the coldest times. On the other hand, iodine is most often used as an antiseptic to treat minor cuts and abrasions. in some household cleaning products and can also be found in foods: seafood, dairy products and canned soups.