What is one reason the carboxyl groups are often written as -cooh instead of -co2h?

If you want to create an electrical current, which situation would produce a solution capable of this

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 terms are used to identify pure substances