Which three statements represent the benefits of performing experiments using computer simulations?

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?

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

What is the most common reason for matter changing its state?