The intensity of light can significantly affect the rate of a chemical reaction between chlorine Cl2 and iodine I2 . This reaction is a photochemical reaction, which means it is driven by the absorption of light energy. The reaction can be represented by the following equation:Cl2 + I2 2ClIIn this reaction, chlorine and iodine molecules absorb light energy usually in the ultraviolet or visible range and break their bonds to form highly reactive free radicals. These radicals then react with each other to form the product, iodine monochloride ClI .The rate of this reaction is directly proportional to the intensity of light. As the intensity of light increases, more energy is available to break the bonds in Cl2 and I2 molecules, leading to a higher concentration of reactive radicals. This, in turn, increases the rate of the reaction and the formation of ClI.In summary, the intensity of light plays a crucial role in the rate of the chemical reaction between chlorine and iodine. Higher light intensity leads to a faster reaction rate, while lower light intensity results in a slower reaction rate.