Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 1 - Questions and Problems - Page 32: 1.39


a) Physical change b) Chemical change c) Physical change d) Chemical change e) Physical change

Work Step by Step

a) Due to diffusion of gas, the helium gas inside a balloon will often leak out after a few hours. During this diffusion, the chemical nature of the helium gas remains unchanged. As there is no chemical change, this must be a physical change. b) If the flashlight beam is getting slowly dimmer, this is likely due to the dying of the battery in it. When the battery dies, this is a chemical change. c) When water is added to frozen orange juice, the chemical nature of the orange juice is not altered. Rather, it is just diluted. This dilution is a physical change, not a chemical one. d) During photosynthesis, the plant uses carbon dioxide, water, and the sun's energy to prepare carbohydrates. During this process, a chemical change takes place. e) When salt is poured into a bowl of soup, it dissolves. This is a physical change, not a chemical one, because neither the chemical composition of the salt nor the soup is altered.
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