Single displacement (replacement)

Explanation:

Single displacement (replacement) is kind of reaction in which 1 atom of reactants only change in product.

Single displacement reaction is a chemical reaction in which a more reactive element displaces the less reactive element from it's compound.

for example :

CuSo4 + Zn = ZnSo4 + Cu

here we can see that zinc which is more reactive than copper displaces copper from it's compound copper sulphate and forms zinc sulphate.

i hope it helped

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.

tracks, burrows, eggshells, nests, tooth marks, or gastroliths