PLS HELP The average atomic mass of carbon is 12.01 amu. Based on the atomic masses of the two isotopes of carbon, how do the relative abundances of the
isotopes compare?

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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'm assuming that it's c.) red bank..