How to calculate how much acetic acid should be theoretically yielded from a process that is 75% efficient and actually yields 500.0 ml (assume the density of acetic acid = 1.05 g/ml)

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.

i think it's c. i'm not sure but i think so.