only a physical change occurred. a chemical change occurred. only a loss of mass occurred. the formation of an element occurred.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A student placed a small chip of limestone into a hydrochloric acid solution, and carbon dioxide gas was released. The carbon dioxide provided evidence that
Possibilities:
- only a physical change occurred.
- a chemical change occurred.
- only a loss of mass occurred.
- the formation of an element occurred.

a chemical change occurred.