Chemistry 9th Edition

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

Chapter 2 - Atoms, Molecules, and Ions - Review Questions - Page 72: 2


Cathode rays were determined to have a negative charge because when a magnet was held near the ray, it was bent. This suggested that the ray had a negative charge because it was affected by the presence of a magnetic field.

Work Step by Step

Cathode rays consist of a vacuum tube with no air inside, a cathode, and an anode. When powered, there is a ray going from the anode to the cathode, and this ray could be deflected by a magnet, suggesting a charge. Additionally, the ray went from the anode to the cathode, and therefore the ray was negatively charged, since negatively charged particles flow from positive (anode) to negative (cathode).
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