"Hornblende is a jet black mineral commonly found in igneous rocks and has the formula Ca2Fe3Si8022(OH)2 explain how to figure out the ionic charge of the Fe and Si ions and what their charges are."

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.