Middle schoolers investigate crude oil. For this crude oil lesson, students investigate fractional distillation and use this technique to separate two liquids.

Students perform several tests on liquids. In this general science lesson, students compare the properties of polymeric and nonpolymeric liquids. They explain the composition and importance of macromolecules.

Students practice bleaching recycled fibers. Using colored copy paper, they cut it into strips and put it in a blender with water. They filter the pulp and stir in the bleach. They compare the original paper with the bleached sample...