Grades 9–12. Students learn to classify and identify matter when they separate mixtures using physical techniques, identify components of these mixtures, and determine whether a change is chemical or physical. In addition, they identify the signs that indicate a chemical change has occurred.Kit provides practice with chromatography, use of the Tyndall effect, calculation of percent error, use of flow charts, and even an activity to differentiate between solutions, colloids, and suspensions. Materials are sufficient for 30 students working in 10 groups.addresses.