Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 8 - Periodic Relationships Among the Elements - Questions & Problems - Page 366: 8.133


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Work Step by Step

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.
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