Classification of Matter Activities This product includes Montessori 4-part cards PLUS 3 additional hands-on extension activities to reinforce this concept. The Classification of Matter activities would be introduced after students have had exposure to the basic definition of matter, states of matter, physical vs chemical properties, and basic intro to the Periodic Table. The 4-part cards include 10 key words (such as Matter, Solution, Compound, etc) with stunning images and clear text to e