2. On a counter is a glass of water with ice cubes floating in it. You measure the temperature and find it to be 0° C. Would the temperature of
the water change if you were to add more ice cubes to the glass? Explain
your answer.

yes

Explanation:

I would get colder the more ice you put in it

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.