Physical vs. Chemical Change Quick Check

Question

1 of 41 of 4 Items
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.

Answer 1

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

A reaction occurs.

This is because a reaction signifies the formation of new substances with different properties, which is characteristic of a chemical change.