Which statement best describes a chemical reaction in which energy is released?

Which substances have the lowest melting points: ionic covalent, or metallic

Which formula equation represents the burning of sulfur to produce sulfur dioxide? s(s) + o2(g) 4502(9) 2h2s(s) + 302(g) —> 2h20(0) + 2502(9) 4fes2+1102 —> 2fe2o3 + 8502 2802(g) + o2(9) v205 , 2503(9)

A5.00 g of a in . g of at aa 5.00 g of b in . g of .?at .