A chemical change occurs when:a new substance is createda substance looks different from beforea substance's physical properties changetwo substances are mixed togetherI'm not sure
Question
A chemical change occurs when:a new substance is createda substance looks different from beforea substance's physical properties changetwo substances are mixed togetherI'm not sure
Solution
A chemical change occurs when a new substance is created. This is because during a chemical change, the molecules of the original substances rearrange to form a new substance with different physical and chemical properties. The other options listed, such as a substance looking different from before, a substance's physical properties changing, or two substances being mixed together, can be characteristics of both physical and chemical changes. However, the creation of a new substance is a definitive sign of a chemical change.
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