Have students choose partners. Have each pair choose a number and numerically choose a molecule. Discuss chosen molecule. Separate, and individually select the colors and quantity of gum drops and tooth picks needed to build the molecular model. Allow class time to build molecules.
Pairs then compare their molecular structures for similarities and differences.
Share models with the class. Display for all classmates to see. Predict how particle theory and molecular models connect with the unit of Mixtures and Solutions. Present the class with a molecular model and have them write down the chemical formula and create a scientific name for that molecule. Ammonium N H 15.