1-Is this an image of a chemical change?
2-What happens to molecules in each object as they change?
you will observe a chemist pouring a fuel liquid into a test tube that causes a small explosion to occur,
1- Yes, this is an image of a chemical change. The small explosion indicates a rapid release of energy, which is typical of a chemical reaction.
2- In the fuel liquid and test tube, molecules undergo a rearrangement of their atoms and connections during the chemical change. Bonds between atoms may break and new bonds may form, leading to the release of energy and the formation of different substances.