An optically active alkyne a (c10h14) can be catalytically hydrogenated to butylcyclohexane. treatment of a with c2h5mgbr liberates no gas. catalytic hydrogenation of a over pd/c in the presence of quinoline poison and treatment of the product b with o3 and then h2o2 gives an optically active tricarboxylic acid c8h12o6. (a tricarboxylic acid is a compound with three

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.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates