Question

In a blank change the appearance changes but the substance does not
GPT-4o mini
The phrase you're describing seems to refer to a "physical change." In a physical change, the appearance or phase of a substance may change (like melting ice into water or dissolving sugar in water), but its chemical composition remains the same. This contrasts with a chemical change, where the substance transforms into one or more different substances with new properties. If you need further information or examples, feel free to ask!