This model represents the progress of a chemical reaction from start to finish. In general, the speed of a chemical reaction is related to the concentration of the reactants, so as the reaction progresses it tends to slow down, eventually approaching completion.
This model documents several different reactions over the course of several experiments each in order to get the most accurate measure possible of their speed. The model allows the user to set the concentration of the reactant with the “fraction” slider, after which point the results are displayed on the graph to the right. Each reaction includes a graph of reactants and products.
Set the initial fraction of the reactants, and then update the cells and graph. The results will be shown automatically. To view other reactions, switch to any of the other four pages.
For reactions that move in only one direction, the concentration of reactants will approach zero while that of products will approach the initial reactant concentration. For reactions that can go both ways, the concentration of reactants and products will eventually reach a steady state, wherein both concentrations remain essentially the same over time.