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

Answer 1

The observation that most likely indicates that only a chemical change has taken place is "The change cannot be reversed."

Chemical changes typically result in the formation of new substances that cannot be easily reverted to their original form, unlike physical changes, which often can be reversed.