Addresses AP® Chemistry Big Idea 4 and Learning Objective 4.2. Determine orders of reaction, calculate reaction rate constants, and write rate laws for the oxidation of 4 food dyes. Students mix a food dye with bleach and monitor the solution's absorbance over time. From their Beer-Lambert graph of absorbance versus time, students write an integrated rate law for the reaction and calculate the reaction's rate constant. Materials sufficient for 30 students working in pairs.