Which of the following conditions will result in a reaction that is spontaneous only at high temperatures?
negative enthalpy change and negative entropy change
negative enthalpy change and positive entropy change
positive enthalpy change and negative entropy change
positive enthalpy change and positive entropy change

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)