Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 1 Basic Concepts of Chemistry - Study Questions - Page 21b: 23


a) Physical b) Physical c) Chemical d) Chemical

Work Step by Step

a) Change in the state of matter (solid to gaseous) is a physical change. b) Molecules occupy more space as their average energy increases: physical change. c) Combustion reaction converts methane and oxygen into carbon dioxide and water vapor, releasing heat: chemical reaction implies chemical change. d) NaCl is an ionic compound, when dissolved in water It breaks into íons ($Na^+$ and $Cl^-$), which is a chemical change.
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