Is. O2(g) + 2H2O(l) + 4e- > 4OH−(aq)

oxidation or reduction?
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What’s the scientific notation for the number 6,840,000,000

What happens to the atomic radius when an elctron is lost

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?