Which of the following explains why elements in column 17 (the halogens) are very reactive? a. their atoms contain three energy levels.. b. their atoms need only one electron to complete their outer energy level.. c. their atoms have large masses.. d. their atoms contain the same number of protons as electrons..

Nitric oxide (no) can be formed from nitrogen, hydrogen and oxygen in two steps. in the first step, nitrogen and hydrogen react to form ammonia: n2(g) + 2 h_2(g) rightarrow 2 nh_3 (g) delta h = -92. kj in the second step, ammonia and oxygen react to form nitric oxide and water: 4 nh_3(g) + 5 o_2(g) rightarrow 4no(g) + 6 h_2o(g) delta h = -905. kj calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

What is the value of keq for the reaction expressed in scientific notation

Drug abuse will not lead to physical and psychological dependence. true or false ?