Which of the following provides evidence that a chemical change has taken place?

the original substance can be recovered by physical processes

a gas is formed when two liquids are mixed

some pieces of substances get smaller or disappear

one substance dissolves in another

Is it D?

Question

Which of the following provides evidence that a chemical change has taken place?
		
the original substance can be recovered by physical processes
		
a gas is formed when two liquids are mixed
		
some pieces of substances get smaller or disappear
		
one substance dissolves in another

Is it D?

sweetburger · Answer

correct

sweetburger · Answer

dissolving is a chemical change

sweetburger · Answer

actuallly

sweetburger · Answer

Geeze I think it depends on what you dissolve.

sweetburger · Answer

If its sugar it wont dissociate so not a chemical change. If its NaCl it is a chemical change because it splits into Na+ and Cl-

rhondasommer · Answer

no because if it disolves it is chemical right? IF it disolves

sweetburger · Answer

Idk im really not sure on this one

rhondasommer · Answer

hmm ok ill go with D because it doesnt specify. I didnt think sugar fully dissolved anyway

sweetburger · Answer

Oh wait... when 2 liquids are mixed and a gas is given off

sweetburger · Answer

It might be b.

rhondasommer · Answer

.-. tickety trickety .-.

sweetburger · Answer

A gas being given off is a tell tale sign of a chemical reaction

sweetburger · Answer

Go with b.

rhondasommer · Answer

okay i guess ill go with b

rhondasommer · Answer

:P