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Yeast transforms the sugar in the dough into carbon dioxide and alcohol ethanol. The trapped carbon dioxide makes the dough rise,

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rust is a chemical change because there is moisture in the air

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rotting is a chemical change because they produce substances that are entirely new chemical compounds.

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crumpled paper is physical change because it's still a paper and can be in its original form

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cooking food is a chemical change because  the raw ingredients or the vegetables cannot be in its original form again.

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boiling water is physical change because nothing is happening to it and it's still water.

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sliced carrots is a physical change because it's still a carrot

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grade here

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Bending a metal wire changes the shape of the wire, which is a physical property which can be back together its original form