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
a chemical reaction a physical change photosynthesis evaporation
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
A. a chemical reaction
B. a physical change
C. photosynthesis
D. evaporation
Answer: