what might be some clues that would help us know whether or not the change is chemical.

Answer 1

This site gives you several clues about chemical changes -- odor changes, color changes, and more.

http://www.ric.edu/faculty/ptiskus/chemical/

Answer 2

chemical: burn, puts off an odor, forms precipitate, new substance

physical: changes state, same substance

Answer 3

thank you very much. that helped me a great deal.

Answer 4

You're very welcome.

Answer 5

thanks a heap i appreciated it a lot.:)