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9 November, 06:55

Why can't chemical changes be undone? Because of the chemical properties. Because Mark is an idiot. Because they need energy. Because new substances are formed.

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  1. 9 November, 07:12
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    Answer: Because new substances are formed.

    Explanation: A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity. Once a chemical change occurs it cannot be undone due to the change in chemical identity. The creation of a new substance is not reversible.
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