A chemist takes four samples of a substance. Each sample has a different melting point. What can the chemist conclude about the substance? A
It is synthetic.
B
It is a pure substance.
C
It is naturally occurring.
D
It is not a pure substance.

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)