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, release of energy, formation of a new substance, or reduction or increase in temperature. This lab will be conducted to create a chemical reaction by changing the reaction rate of a substance. To change the reaction rate you need to add a catalyst, in this case the catalyst in a hydrogen ion. Iodine and propane will be mixed and then catalyzed by hydrogen ions, in turn helping to modify the speed of the reaction. Some terms and ideas that will be explored in this experiment are the rate of a chemical reaction and how it is affected by the concentration of the reactant or reactants. The concentration of the reactant is the strength of the solution. The way in which the concentration of reactants affects the rate of reaction is commonly known as 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 the reactants” (Holt 2006). To understand or determine the rate of this chemical process you can make an educated guess about the reaction mechanism. “The reaction mechanism is the way a chemical reaction occurs, expressed in a series of chemical equations. For a reaction involving a single reactant, the rate is often proportional to the concentration of the reactant raised to a certain power” (Holt 2006). Rate= k [reactant]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 enter the... center of the card ...each of these elements is used in the real world. For example, propane is used to fuel grills and hot air balloons; it is also used to fuel airsoft/paintball guns and is also used on movie sets to cause damage. Most importantly, propane heats many households in the United States, keeping people warm in colder weather. Iodine, on the other hand, is more commonly used as an antiseptic to treat small cuts and abrasions in some household cleaning products and can also be found in foods: seafood, dairy products, and canned soups.