Assume that aniline is insoluble in water. the normal boiling points of aniline and water are 184.1°c and 100°c respectively. at a pressure of i atm, the boiling point of a mixture of aniline and water is a) 184.1°c b) 100°c c) less than 100°c d) greater than 100°c but less than 184.1°c.

B.)

Explanation:

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.