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

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

anonymous · Answer

the last three are evidences

anonymous · Answer

yeah that's what I thought too. Which do you think is most likely to be the answer?

anonymous · Answer

Since I can only choose one answer. Also thank you for responding!