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 - 1-6 Physical Properties - Review & Check for Section 1-6 - Page 15: 1


C-Burning of gasoline in the air is not a physical property. It is a chemical change.

Work Step by Step

To observe this property, the composition of the substance would have to change; therefore, it is not a physical property. Physical properties refer to the characteristics of matter that can be measured without altering its composition. Matter is described and observed based on physical properties. Some of the physical properties include melting point, boiling point, and color. Burning gasoline in the air is not a physical property. It is a chemical process of combustion. During the process, gasoline, a hydrocarbon, combines with oxygen from the atmosphere to form carbon dioxide and water vapor. Heat and light energy are also produced during the process. The boiling of liquid nitrogen at -196 is a physical property/process involving the change of physical state from liquid to gas. The molecular structure of nitrogen does not change. In both the liquid and gaseous states, nitrogen exists as a diatomic molecular gas/N2 The melting of gold at 1064 °C is a physical property. When gold melts, its molecular structure does not change. No new substance is formed. Only the intermolecular forces become weaker, and the intermolecular spaces are larger in the liquid state. Dissolving sugar in water is a physical property. When sugar dissolves in water, the individual sugar molecules are separated, but the covalent bonds holding the carbon, hydrogen, and oxygen atoms remain intact. It is also simple to reverse the dissolution of sugar in water. A copper compound's blue color is a physical property, but its formation is a chemical change. Anhydrous copper (II) Sulphate, which does not contain water, is white. When water is added to anhydrous copper (II) Sulphate, it changes from white to blue. The water molecules are incorporated into the ionic lattice of the copper (II) Sulphate, which ceases being anhydrous copper (II)Sulphate and becomes hydrated copper (II) Sulphate, which is blue. It is a chemical process because of the formation of hydrated copper (II) Sulphate, which is a new substance.
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