A balanced chemical equation can be visualized using a particulate diagram, in which each of the atoms involved in the reaction is represented using a circle or a sphere. To be consistent with the law of conservation of mass, the diagram should depict the same numbers and types of atoms on each side of the reaction arrow. View more lessons or practice this subject at https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:chemical-reactions/x2eef969c74e0d802:representations-of-reactions/v/visualizing-chemical-equations-using-particulate-models
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