Spice and k2 are together a mixture of herbs with psychoactive properties that has been successfully marketed as an incense substitute for

Spice and k2 are together a mixture of herbs and synthetic cannabinoids with psychoactive properties that have serious side-effects and can even lead to death but despite that have been successfully marketed as a Marijuana alternative.

i dont know

explanation:

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.