In the simulation, there are three balls on the floor. Drag each of them up off the floor, and then let go. See what happens to the balls. In what way do the balls behave the same? In what way do they behave differently?

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.

the pseudoscience are like beliefs, theories, or like practices that are considered scientific