What is the chemical name of this reaction Ca(OH)2(aq) + H2(g)?

combination reaction

as calcium oxide and water combine it forms a single product, calcium hydroxide.

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.