Final answer:
In burning a match a chemical change happens because new substances are formed, while boiling of a liquid is a physical change, as there is a change of state, but no new substances are created.
Step-by-step explanation:
When a match is burnt, a chemical change occurs. This is because the substances at the start (the match and oxygen in the air) are different from the new substances created by the reaction, which include carbon dioxide and water vapour. This reaction also results in the release of energy in the form of light and heat, which is common in chemical reactions.
On the other hand, when a liquid starts boiling, it undergoes a physical change. The boiling process transforms the liquid into gas due to the increase in temperature. However, even though the state of the substance changes, the molecular composition remains constant. In this process, no new substances are formed.
Learn more about Physical and Chemical Changes