When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place?
A) Solid melts.
B) Heat is given off.
C) Substance dissolves
D) Substance changes shape.

Question

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place?
A)	Solid melts.	
B)	Heat is given off.	
C)	Substance dissolves	
D)	Substance changes shape.

jojo12g · Answer

@sweetburger

lxoftmuzick · Answer

Usually, when a chemical change takes place, it changes in temperature, color, odor, and emission of gas.

abb0t · Answer

This is such a strange question because only through chemical analysis of the product can you be certain that a chemical reaction has taken place. 
But, of those choices, I would say heat given off would be a good observational indicator.