The following is known as the thermite reaction: 2al(s)+fe2o3(s)→al2o3(s)+2fe(s) this highly exothermic reaction is used for welding massive units, such as propellers for large ships. using enthalpies of formation in appendix c, calculate δh∘ for this reaction.

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)