Consider the chemical equilibrium of the reaction. agcl(s) < > ag+(aq) + cl–(aq) what will happen to the chemical equilibrium if agno3 is added? there is no shift in the chemical equilibrium of the system. the chemical equilibrium of the system shifts to the right. the chemical equilibrium of the system shifts to the left. the chemical equilibrium of the system is destroyed.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.