Which phenomenon occurs when a wave encounters a non–transmitting barrier?

Either absorption or reflection. Probably some of both.

This is what i found on google “lithium and sulfide can react together to form litium sulfide(li2s). when lithium sulfide hydrolyses(breaks down) in air, it releases hydrogen sulfide which is characteristized by a rotten egg odor.” i hope this you for what your looking for

Yup no bull frogs here man