Question

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.

1 answer

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

A reaction occurs.

This is because a chemical change involves the formation of new substances, which is typically evidenced by a reaction, such as a color change, gas production, or temperature change.