Which observation most likely indicates that only a chemical change has taken place?(1 point) Responses States of matter changes. States of matter changes. The shape changes. The shape changes. The change cannot be reversed. The change cannot be reversed. A reaction occurs.

Answer 1

The observation that most likely indicates that only a chemical change has taken place is: A reaction occurs.

While changes in states of matter and shape can occur in both physical and chemical changes, the occurrence of a reaction typically implies that new substances have formed, which is a characteristic of a chemical change.