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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

TABLE OF CONTENTS :
TABLE OF CONTENTS

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.

Most popular questions for Physics Textbooks

Explorers on failed Arctic expeditions have survived by covering themselves with snow. Why would they do that?

After a hot shower and dishwashing, there seems to be no hot water left in the 65-gal (245-L) water heater. This suggests that the tank has emptied and refilled with water at roughly 10°C. (a) How much energy does it take to reheat the water to 45°C? (b) How long would it take if the heater output is 9500 W?

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(a) If two objects of different temperatures are placed in contact, will heat naturally flow from the object with higher internal energy to the object with lower internal energy? (b) Is it possible for heat to flow even if the internal energies of the two objects are the same? Explain.

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(b) melt 1.0 kg of snow using a stove and drink the resulting 1.0 kg of water at 2°C, which your body has to warm to 37°C.
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