Question

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

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.

Answers

bobpursley
I would add to that when a new chemical compound has been formed.
Lena
Thank you so much :)
William
Form new substance (new structure)
Liberate energy
Form new molecules
Change bonding
Lena
Thanks You :)
~christina~
I wrote:
- theres a smell of ordur <b>odor</b>
- change in color
- fizzing or bubbling
- percipitate forms <b>precipitate</b>
- 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.
~christina~
Energy could be in the form of
a) heat
b) light

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