What branch of chemestry studies changes in the chemical reactiojs?

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

Why is carbon ideal for making different compounds?