Question

which of these is an example of a physical change?
○ a banana ripening in the air
○ hydrogen burning in the air
○ zinc reacting with an acid
○ liquid water turning into vapor

Explanation:

A physical change involves a change in physical state (like liquid - gas) without a change in chemical composition. Liquid water turning into vapor is a change of state from liquid to gas and no new substances are formed. Zinc reacting with an acid and hydrogen burning in air are chemical reactions forming new substances. A banana ripening in the air involves chemical changes related to enzymatic and oxidative processes.

Answer:

A. liquid water turning into vapor