Word equation: Magnesium oxide + Water → Magnesium hydroxide
Type of Chemical Reaction: For this reaction we have a combination reaction.
Balancing Strategies: In this combination reaction the MgO and H2O come together to from Magnesium hydroxide. That's way it's called a combination reaction.
Be sure to count all of the oxygen atoms on the reactant (left) side of the equation. There is an O atom in both MgO and one in H2O.