What are the 5 signs that show a chemical change has taken place?

Question

I wrote:
- theres a smell of ordur
- change in color
- fizzing or bubbling
- percipitate forms
- difficult to reverse

Could you name a couple more please and tell me if those are right. Thank you.

Answer 1

I would add to that when a new chemical compound has been formed.

Answer 2

Thank you so much :)

Answer 3

Form new substance (new structure)
Liberate energy
Form new molecules
Change bonding

Answer 4

Thanks You :)

Answer 5

I wrote:
- theres a smell of ordur odor
- change in color
- fizzing or bubbling
- percipitate forms precipitate
- difficult to reverse

I think the last one doesn't fit.

Temperature change is another way to tell a chemical rxn has took place.

I also corrected some spelling errors above.

Answer 6

Energy could be in the form of
a) heat
b) light