Physical processes _______ change substances?

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Physical processes do not change substances, at least not chemically. Physical processes change the state of the substance or form of the substance. For example, if we heat a solid to sufficiently high temperatures, it will melt and convert to liquid form. Thus, the state of the substance changes from solid to liquid through the physical process of heating. We can similarly convert substances from liquid to gas phase by heating them (the evaporation of water is one example). Certain materials are malleable and ductile and can be beaten into shape or drawn into wires. However, no such process changes the substance. For example, ice (solid), water (liquid) and vapor (gas) all are still forms of water. Similarly, gold sheet or wire is still gold in either form. A change will happen in a substance if we change its chemical composition; this is possible only through chemical changes.

Thus, physical processes do not change a substance. They can change only its form, appearance or state.

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