## Chemistry 12th Edition

Some elements and compounds can act both as reducing or oxidizing agents. The hydrogen molecule is a reducing agent when it reacts with non-metals and an oxidizing agent when it reacts with metals. $2 Li_{(s)} + H_{2(g)} → 2 LiH_{(s)}$ Hydrogen acts as an oxidizing agent because it accepts an electron from lithium, which causes Li to be oxidized. $H_{2(g)} + F_{2(g)} → 2 HF_{(g)}$ Hydrogen acts as a reducing agent because it donates its electrons to fluorine; as a result, fluorine gets reduced.