I use this simulation as an introduction to molecules and compounds to help students understand that atoms are not randomly joined to form a compound/molecule, but join in very specific patterns. In order to successfully complete the simulation activity, students must re-arrange molecules various ways. (In CH3COOH, both oxygens are bonded to the carbon atom, for example)
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SC.912.P.8.4: Explore the scientific theory of atoms (also known as atomic theory) by describing the structure of atoms in terms of protons, neutrons and electrons, and differentiate among these particles in terms of their mass, electrical charges and locations within the atom.
SC.912.P.8.5: Relate properties of atoms and their position in the periodic table to the arrangement of their electrons.
SC.912.P.8.7: Interpret formula representations of molecules and compounds in terms of composition and structure.