Must new substances be formed when you observe a chemical property? My answer is no because you are just observing. There is no reaction taking place. I don't know if my answer is correct.

4 answers

Oh thank you anyway
if there is no reaction...what are you observing?
Physical changes vs. Chemical Changes

Chemical changes - a reaction does occur. Changing Hydrogen and Oxygen into water.

Physical Change would be changing water into ice. It is still water just in a different form.
the question specifies "chemical property"