Which statement describes all chemical changes, but not all physical changes?

Question

Bubbles are produced.
A new substance forms.
Phase changes occur.
A color change occurs.

Answer 1

The statement that describes all chemical changes, but not all physical changes is:

A new substance forms.

This is characteristic of chemical changes, which involve the transformation of reactants into products with different properties. In contrast, physical changes may involve changes in state, shape, or appearance without forming new substances.