the formation of bubbles a reduction in total mass the disappearance of atoms an increase in the number of atoms
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Students combined baking soda and vinegar to demonstrate a chemical reaction. What indicates that a chemical reaction occurred?
Possibilities:
- the formation of bubbles
- a reduction in total mass
- the disappearance of atoms
- an increase in the number of atoms

the formation of bubbles