Which statement describes a physical change? Iron combines with oxygen to form rust. Calcium is added to acid and hydrogen gas is produced. Sodium metal reacts explosively with oxygen. Lead is heated and becomes more viscous.

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Which statement describes a physical change? Iron combines with oxygen to form rust. Calcium is added to acid and hydrogen gas is produced. Sodium metal reacts explosively with oxygen. Lead is heated and becomes more viscous.

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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http://openstudy.com/study#/groups/Chemistry Which one does not involve a chemical reaction?
@CliffSedge duude , i need the answer really bad. common , i'll give you the best response if you give me the answerr.
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I am immune to bribes, sorry.
freakinn aye man . bye

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