Properties of matter 2nd grade science experiment: Testing for flexibility. This easy, hands-on science experiment for kids is a fun way to explore and test properties of matter in second grade. Any objects you have in your classroom work great for this simple flexibility test as your students are learning about properties of solids. Math Stem Activities, Matter Activities, Montessori Activities, Newborn Montessori, Stem Preschool, Science Centers, Kindergarten Science, Science Classroom, Teaching Science