Out of the options, the best indicator is a color change since it is the only one that can't really be blamed on a physical change. you will eventually notice that during qualitative labs and some quantitative labs, usually the thing that you are looking for is either color change or the production of a precipitate to indicate the presence of a chemical reaction
a. Emma creates a pressure difference allowing the fluid to flow.
Answer:
It is better to do chemistry
Explanation:
So that you will learn more of chemicals
The rock is limestone, I hope this helps!!
