Changing the ratio of reactants in a chemical reaction can significantly impact the reaction rate. The reaction rate is influenced by the concentration of reactants, as described by the rate law for a given reaction. The rate law is an equation that relates the rate of a reaction to the concentrations of the reactants, often in the form:Rate = k[A]^m[B]^nwhere Rate is the reaction rate, k is the rate constant, [A] and [B] are the concentrations of reactants A and B, and m and n are the reaction orders with respect to A and B, respectively.When the ratio of reactants is altered, the concentration of one or more reactants changes, which can affect the reaction rate. The reactant s with the greatest impact on the reaction rate will be the one s with the highest reaction order m or n in the rate law. The overall stoichiometry of the reaction can also play a role, as it determines the relative amounts of reactants needed for the reaction to proceed.Experimental evidence can be obtained by conducting a series of experiments in which the ratio of reactants is systematically varied while keeping other factors e.g., temperature, pressure constant. By measuring the reaction rate under these different conditions, one can determine the effect of changing the reactant ratio on the reaction rate.For example, consider the reaction between hydrogen and iodine to form hydrogen iodide:H2 + I2 2HIIn a series of experiments, the initial concentrations of H2 and I2 are varied, and the reaction rate is measured. The results can be used to determine the rate law for the reaction:Rate = k[H2]^x[I2]^yBy analyzing the experimental data, it is found that the reaction is first-order with respect to both H2 and I2 x = 1, y = 1 . Therefore, the reaction rate is directly proportional to the concentration of both reactants. In this case, changing the ratio of H2 and I2 will have a significant impact on the reaction rate, as both reactants have an equal influence on the rate.In summary, the effect of changing the ratio of reactants on the rate of a chemical reaction depends on the reaction orders of the reactants in the rate law and the overall stoichiometry of the reaction. Experimental evidence can be obtained by systematically varying the reactant ratios and measuring the reaction rate under controlled conditions.