Which of the following is an indication that a chemical reaction has taken place?
A)change in color
B)production of a gas
C)release of heat
D)formation of a solid
E)all of the above

Question

Quizplus · Accepted Answer

All of the listed options are indications that a chemical reaction has taken place. A change in color means that the reactants have transformed into different products that may have different physical characteristics. Production of a gas indicates that a chemical change has occurred, as the reactants have undergone a transformation that results in the release of gas molecules. Release of heat is usually a sign of an exothermic reaction, where energy is given off during the reaction. Formation of a solid from two or more solutions is a clear sign of a chemical reaction, as the reactant molecules have combined to form a completely new substance with different properties. Therefore, all of the above are good choices that indicate a chemical reaction has taken place.

Which of the Following Is an Indication That a Chemical