Task: Question Understanding
Input (English): Question: Hydrochloric acid is added to a beaker containing a piece of zinc. As a result, zinc chloride is formed and hydrogen gas is released. This is an example of (1) a chemical reaction (2) a physical change (3) photosynthesis (4) evaporation?
Output (English): Hydrochloric, acid, added, piece, zinc., zinc, chloride, formed, hydrogen, released., example