
Concept explainers
Interpretation:
Whether the given figures are physical or chemical change.
Concept introduction:
The nature of any substance is explained by their chemical properties and physical properties.
A physical property describes the physical changes of a substance. Physical change is a temporary change; it is a reversible change. For example, color, mass, volume, etc.
A chemical property describes how a substance reacts with other substances. In a chemical change, a new substance is formed and absorption of energy or loss of energy occurs; it is an irreversible change. For example, rusting, dissolving, etc.

Answer to Problem 42A
The first diagram represents the physical change and the second diagram represents the chemical change.
Explanation of Solution
In the first diagram, the molecule state and position of the composition are changed. Their composition remains the same. So, it is the physical change
In the second diagram, moleculesof the composition are changed. Also, here a new product is formed. So, it is the chemical change.
The first diagram: physical change
The second diagram: chemical change
Chapter 3 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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