Consider the following reaction of calcium hydride (cah2) with molten sodium metal: cah2(s) + 2 na(l) -> 2 nah(s) + ca(l) identify the species being oxidized and the species being reduced?

This is not a redox reaction. None of the species are reduced and none are oxidized

Explanation:

In a redox reaction at least one species must be oxidized and another reduced. You see this by a change in oxidation number. In this question the oxidation numbers are the same before and after the reaction.

Ca  2

H  -1

Na +1

I -1

dynamic equilibrium is the answer.