You don't have to be a rocket scientist to understand matter and energy with our Physical Science 3-book BUNDLE. About this Resource: Students discover what matter is with Properties of Matter. Identify atoms, particles and molecules before exploring the three states of matter. Experiment with photosynthesis, an important chemical change. Then, explore the invisible world of Atoms, Molecules and Elements. See how the atomic model is made up of electrons, protons and neutrons. Get comfortable wit