Which letter would be affected by the catalyst and why? What do the other letters represent?

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

Hno2 + caco3 = h2co3 + ca(no2) can someone balance this