Grape juice turns to wine chemical or physical change?

* New substances are formed: The sugar in grape juice is converted into alcohol and carbon dioxide through fermentation, which is a process carried out by yeast. This is a chemical reaction, and entirely new substances are created that weren't present before.

* Irreversible process: While you can boil off the alcohol from wine, you can't easily reverse the fermentation process to get back pure grape juice.

Here are some additional points:

* Physical changes involve alterations in the form or appearance of a substance, but not its chemical composition. Examples include melting ice, cutting paper, or dissolving sugar in water.

* Chemical changes result in the formation of new substances with different chemical properties.

Therefore, the transformation of grape juice into wine is a chemical change due to the formation of new substances through a chemical reaction.