Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 18 - Electrochemistry - Review of Oxidation-Reduction Reactions - Page 877: 15


Oxidation is losing electrons and the increase in oxidation number. Reduction is gaining electrons and the decrease in oxidation number.

Work Step by Step

Always remember "OIL RIG" OIL Oxidation Is Loss (of electrons) RIG Reduction Is Gaining (of electrons) and when a substance loses an electron (which is negative) it becomes more positive, therefore, its oxidation state increases and the opposite is true here for reduction.
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