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the formation of water in a car engine cannot be chnaged bakc to its original state. If you melt ice, it can be turned back into ice.

A chemical change cannot be turned back into its original form. But a physical chnage can be turned bakc into its original form.

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Q: Why is the formation of water in a car engine a chemical change but when the ice meltws to form water it is not a chemical change?
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