Question

In the reaction `2Li(s) + 2H_2O(l) -> 2LiOH(aq) + H_2(g)`, what compound is in the liquid state?

Answer 1

`H_2O`

Explanation:

The letters between brackets by the compounds represent their state of matter:

`(s)` means it's something solid
`(l)` means it's something liquid
`(aq)` means it's something aqueous, that is, something that's either dissolved or can only exist in solution like an ion.
`(g)` means it's a gas.

Since the equation given already has those to see which one is liquid you just need to check the letters.