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29 December, 12:27

What criteria are used to distinguish between a chemical change and a physical change

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  1. 29 December, 12:55
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    If the ending substance has changed its properties. For example if iron rusts it is a chemical change because it is no longer the same as before it is now just rust. A physical change only changes the appearance but burning something or changing it's chemical properties is a chemical change.
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