When milk turns sour, this is a physical change because a change in odor does not indicate a chemical change. When citric acid and baking soda mix, carbon dioxide is produced and the temperature decreases. This must be a chemical change. Identify each of the following as a physical or chemical change. A ( Physical or Chemical ) change is a change of matter from one form to another without a change in chemical properties. A ( Physical or Chemical ) change is a change that occurs when a substance changes composition by forming one or more new substances.
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