Interesting to understand the differences between physical and chemical transformation. Makes me wonder: is nuclear fission a chemical or physical change?
I think it is a physical change because, like the "crushing a rock" example, it involves a physical object to bombard another physical object with the concomitant release of a massive amount of energy.
Another question: does a chemical require energy? Actually, it doesn't always require energy, as in a spontaneous process involving a diamond turning into graphite over a very long time.
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