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A physical change, for instance, is melting a solid chunk of ice in a pot. The ice is a solid, melts to a liquid when you supply energy (heat) to it, and when even more energy is supplied - will change to a gas (water vapor or steam). The components of water, H2O, do not change in any of these processes. They simply have very little(ice), or alot of energy(steam).

A chemical change, would change the chemical properties of that H2O molecule. For instance, when you place water in between a high voltage capacitor (two conductive plates spaced apart), this energy will strip the hydrogen from the H2O molecule and leave you with O2, and gaseous Hydrogen. This is a chemical change.

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Q: What the difference between a physical change and a chemical change?
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