a chemical reaction a physical change photosynthesis evaporation
I am hesitating between 4 options to answer the following question, which option should I choose?
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
Possibilities:
- a chemical reaction
- a physical change
- photosynthesis
- evaporation

a chemical reaction