In this lab, you will use a precise scale and heat to identify the mole ratio of an unidentified hydrate.
Write an investigative question that you can
answer by doing this experiment.
DONE

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.

can you list the answers so i can answer