The organic compound di‑n‑butyl phthalate, C 16 H 22 O 4 ( l ) , is sometimes used as a low‑density ( 1.046 g ⋅ mL − 1 ) manometer fluid. Compute the pressure in torr of a gas that supports a 463 mm column of di‑n‑butyl phthalate. The density of mercury is 13.53 g ⋅ mL − 1 .

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