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OpenStudy (anonymous):
Which of the following is a physical change? A. a copper skillet tarnishing B. the sublimation of dry ice C. an iron bar rusting D. oil floating on water
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terenzreignz (terenzreignz):
This is a chemistry question? A physical change means that the substance remains the same, despite the change, ie only its state of matter or its amount changes. Does that help?
OpenStudy (anonymous):
Its B. The Sublimation of dry ice
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