Question

After a match has burned which of these is not proof that a chemical reaction occurred?

A) smoke was formed
B) heat was released
C) some of the match stick did not burn
D) the red chemical on the end of the matchstick is gone

Answer 1

C. i say this because heat and smoke are signs that a chemical reaction is happening. for d if its gone obviously something had to have happened whether it was a chemical or physical reaction so whats left is C.

Answer 2

In my estimation I would say C, I was leaning towards A, but I believe that would merely be "incomplete combustion." I hope this was semi-helpful!