what causes the styrofoam to disappear into the acetone?

what causes the styrofoam to disappear into the acetone?
Answer
Brief Explanations:
Styrofoam is a polystyrene - based material. Acetone is a solvent. Polystyrene is soluble in acetone. The acetone breaks down the polystyrene's long - chain structure, causing it to dissolve.
Answer:
Styrofoam (polystyrene) is soluble in acetone, and acetone breaks down its structure causing it to dissolve.