Problem: 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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physical change  no change in chemical composition

chemical change  change in chemical composition as a result of a chemical reaction


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Problem Details

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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