What happens to a sample of matter when it's particles lose kinetic energy?

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 of these features are formed when hot groundwater is forced out through cracks in the earth's surface?

How many moles of oxygen gas are produced from the decomposition of six moles of potassium chlorate