Chapter 2.2, Problem 5RQ

Interpretation Introduction

Interpretation: Whether all physical changes accompanied by chemical changes and all chemical accompanied by physical changes or not needs to be explained.

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 5RQ

No, all physical changes are not accompanied by chemical changes. Yes, all chemical changes are accompanied by physical changes.

Explanation of Solution

Physical changes are a reversible change whereas, chemical changes are not reversible change.All chemical changes are accompanied by energy changes but in physical change, it is not required. Hereafter, physical changes do not accompany by chemical changes, but chemical changes do accompany by physical changes.