Which observation most likely indicates that only a chemical change has taken place?(1 point)

Question

Responses

States of matter changes.
States of matter changes.

The change cannot be reversed.
The change cannot be reversed.

The shape changes.
The shape changes.

A reaction occurs.
A reaction occurs.

Answer 1

The observation that most likely indicates that only a chemical change has taken place is:

A reaction occurs.

This response suggests that new substances are formed, which is characteristic of a chemical change, in contrast to physical changes that may involve changes in state or shape but do not produce new substances.