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physical change → no change in chemical composition
chemical change → change in chemical composition as a result of a chemical reaction
Which of these changes are physical and which are chemical? Explain.
(a) Plants make sugar from carbon dioxide and water.
(b) Water vapor in the air forms frost.
(c) A goldsmith melts a nugget of gold and pulls it into a wire.
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Based on our data, we think this problem is relevant for Professor Dixon's class at UCF.