Which of these indicates that a liquid has transferred thermal energy to the air?

D

Temperature is equivalent to kinetic energy under the collision theory of matter. This shows that losing kinetic energy to the air (a "transfer" of thermal energy) is the same as a decreasing temperature.

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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.