What values can be obtained from the min/max thermometer?
a.) the minimum, maximum, and current temperature.
b.) the minimum and maximum temperature only.
c.) either the minimum or maximum temperature only, depending on the selection.
d.) the minimum and maximum temperature and the current pressure.

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.