Why is crumpling a sheet of aluminum foil a physical change ?
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because no new substance is formed and this change is reversible ... chemical change occurs when a substance changes it's chemical properties
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A sheet of paper falls slower then the one crumpled into a ball because the surface area of the ball is much lower than that of the sheet. Thus the upward force exerted by air on the sheet is much as compared to the one exerted on the ball. Hence the sheet falls slower.
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