Middle School Chemistry: Molecules Matter

Six middle school chemistry lessons about the periodic table and bonding complete with handouts and animations.

Learners build a model of a water molecule and design an experiment to see if adding energy affects the rate of evaporation.

Five exemplary chemistry lessons about the three states of matter complete with handouts and animations.

Students observe and describe, on the molecular level, how heating and cooling affect the motion of molecules in a solid.

Five chemistry lessons about phase changes between the states of mattter complete with handouts and animations.

Slide the temperature gauge and see what happens to the movement of the molecules.

Students observe, on a molecular level, how heating and cooling affect molecular motion.

Nine exemplary chemistry lessons about the water molecule and dissolving complete with handouts and animations.

Calculate the density of cubes made of different materials to determine what type of material it contains. Using this information explain that the size, mass, and arrangement of the atoms or molecules of a substance determines its density.

Young scholars use their own model of a salt crystal and water molecule to show how water dissolves salt. Then, they relate their observations to the structure of salt, water, and alcohol on the molecular level.