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Physics Principles with Applications
Found in: Page 390
Physics Principles with Applications

Physics Principles with Applications

Book edition 7th
Author(s) Douglas C. Giancoli
Pages 978 pages
ISBN 978-0321625922

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Short Answer

Which of the following happens when a material undergoes a phase change?

(a) The temperature changes.

(b) The chemical composition changes.

(c) Heat flows into or out of the material.

(d) The molecules break apart into atoms.

(c) Heat flows into or out of the material.

See the step by step solution

Step by Step Solution

Step 1: Understanding the phase change of a material

Phase change is a property of a material due to which it changes from one state to another. It occurs generally at sublimation, melting, and boiling points of the material.

Step 2: Explanation for the properties of materials during phase change

Heat is transferred from one material to another. Heat can be supplied or removed from the material. However, during phase change, the temperatures of the materials are equal; so no change in the temperature occurs.

When the material undergoes a phase change, the thermal energy of the material at that temperature is equal to the molecular binding energy between the two phases.

These binding energies are less than the energy required to break the molecules of the material into atoms. However, the chemical composition of the material does not change until the combustion state of the material is reached.


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