Brainliest to the correct answer
i need this asap

not 100% sure about significant figures. density might be rounded weirdly, not sure. Idk how to find hardness, so I just found the mineral before hardness, and used the hardness of that mineral

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.

ill try to . no promises tho.

explanation: