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Narrative
Polyethylene and polystyrene are used to make many familiar objects. When polystyrene from a plastic medicine cup is burned, it gives off a smoky flame characteristic of aromatic compounds. Polyethylene from a milk bottle burns with a non-smoky flame.

Discussion
Samples of polystyrene and polyethylene are shown and small portions are burned in air. Polystyrene gives off a smoky flame characteristic of aromatic compounds. Polyethylene burns with a non-smoky flame.