Students should be able to: Formulate simple hypothesis and test them before they can draw conclusions based on specific information. Explain how molecules of a substance move relative to other molecules of the same substance Describe the atomic structure of matter State the constituents of the atom Use molecular theory to explain the three states of matter. Describe the structure of simple crystals. Distinguish between crystalline and amorphous substances Use the concept of photon to explain that light behaves like particle.