which statement describes all chemical changes, but not all physical changes?\no bubbles are produced.\no a…

Brief Explanations:

Chemical changes involve the formation of new substances due to chemical reactions. Physical changes only affect physical properties like state or appearance without creating new substances. Bubbles can form in physical changes like boiling (a phase - change physical process). Phase changes are physical changes. Color changes can also occur in physical changes (e.g., mixing colored substances without reaction). But the formation of a new substance is unique to chemical changes.

Answer:

A new substance forms.