Is mixing cookie dough a physical change?
Yes, mixing cookie dough is a physical change. Here's why:
* No new substances are formed: You're simply combining existing ingredients (flour, sugar, butter, etc.) and changing their physical arrangement. The chemical composition of each ingredient remains the same.
* Changes are reversible: You could, in theory, separate the ingredients back out.
* Only physical properties change: The dough becomes a different shape, texture, and consistency, but the chemical makeup of the ingredients doesn't change.
Contrast this with a chemical change:
* Baking the cookie dough is a chemical change. The heat causes chemical reactions that change the ingredients into a new substance (the cookie). This change is irreversible.
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