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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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Are changes in state physical or chemical changes? Explain. What type of forces must be overcome to melt or vaporize a substance (are these forces intramolecular or intermolecular)? Define the molar heat of fusion and molar heat of vaporization. Why is the molar heat of vaporization of water so much larger than its molar heat of fusion? Why does the boiling point of a liquid vary with altitude?

Interpretation Introduction

Interpretation:

Whether the changes in state are physical or chemical are to be explained. The type of forces that must be overcome to melt or vaporize a substance is to be stated. The molar heat of fusion and molar heat of vaporization are to be defined. The reason as to why the molar heat of vaporization of water so much larger than its molar heat of fusion is to be stated. The reason as to why the boiling point of a liquid varies with altitude is to be stated.

Concept Introduction:

The physical changes do not involve the changes in chemical structures of the substances, whereas chemical changes involve the changes in chemical structure of the substances. The intermolecular forces are strong in solid particles as compared to liquid particles. The gaseous particles possess weak intermolecular forces.

Explanation

The change in a state of the substance does not change its chemical composition. For example, water and ice have the same chemical composition. Therefore, the changes in state of the substance are referred to as physical changes.

Intermolecular forces hold two or more substances together, whereas intramolecular forces are present within the same molecule. During the vaporization or melting of a substance, intermolecular forces are present. For example, water molecules are combined with each other by hydrogen bonding. Therefore, the type of forces must be overcome to melt or vaporize a substance is intermolecular forces.

At constant pressure and temperature, the amount of energy which is required to change the state of 1mole of solid substance into a liquid state is referred to as molar heat of fusion

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Chapter 15 Solutions

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Sect-15.8 P-15.10SCSect-15.8 P-15.11SCCh-15 P-1ALQCh-15 P-2ALQCh-15 P-3ALQCh-15 P-4ALQCh-15 P-5ALQCh-15 P-6ALQCh-15 P-7ALQCh-15 P-8ALQCh-15 P-9ALQCh-15 P-10ALQCh-15 P-11ALQCh-15 P-12ALQCh-15 P-13ALQCh-15 P-14ALQCh-15 P-1QAPCh-15 P-2QAPCh-15 P-3QAPCh-15 P-4QAPCh-15 P-5QAPCh-15 P-6QAPCh-15 P-7QAPCh-15 P-8QAPCh-15 P-9QAPCh-15 P-10QAPCh-15 P-11QAPCh-15 P-12QAPCh-15 P-13QAPCh-15 P-14QAPCh-15 P-15QAPCh-15 P-16QAPCh-15 P-17QAPCh-15 P-18QAPCh-15 P-19QAPCh-15 P-20QAPCh-15 P-21QAPCh-15 P-22QAPCh-15 P-23QAPCh-15 P-24QAPCh-15 P-25QAPCh-15 P-26QAPCh-15 P-27QAPCh-15 P-28QAPCh-15 P-29QAPCh-15 P-30QAPCh-15 P-31QAPCh-15 P-32QAPCh-15 P-33QAPCh-15 P-34QAPCh-15 P-35QAPCh-15 P-36QAPCh-15 P-37QAPCh-15 P-38QAPCh-15 P-39QAPCh-15 P-40QAPCh-15 P-41QAPCh-15 P-42QAPCh-15 P-43QAPCh-15 P-44QAPCh-15 P-45QAPCh-15 P-46QAPCh-15 P-47QAPCh-15 P-48QAPCh-15 P-49QAPCh-15 P-50QAPCh-15 P-51QAPCh-15 P-52QAPCh-15 P-53QAPCh-15 P-54QAPCh-15 P-55QAPCh-15 P-56QAPCh-15 P-57QAPCh-15 P-58QAPCh-15 P-59QAPCh-15 P-60QAPCh-15 P-61QAPCh-15 P-62QAPCh-15 P-63QAPCh-15 P-64QAPCh-15 P-65QAPCh-15 P-66QAPCh-15 P-67QAPCh-15 P-68QAPCh-15 P-69QAPCh-15 P-70QAPCh-15 P-71QAPCh-15 P-72QAPCh-15 P-73QAPCh-15 P-74QAPCh-15 P-75QAPCh-15 P-76QAPCh-15 P-77QAPCh-15 P-78QAPCh-15 P-79QAPCh-15 P-80QAPCh-15 P-81QAPCh-15 P-82QAPCh-15 P-83QAPCh-15 P-84QAPCh-15 P-85QAPCh-15 P-86QAPCh-15 P-87QAPCh-15 P-88QAPCh-15 P-89APCh-15 P-90APCh-15 P-91APCh-15 P-92APCh-15 P-93APCh-15 P-94APCh-15 P-95APCh-15 P-96APCh-15 P-97APCh-15 P-98APCh-15 P-99APCh-15 P-100APCh-15 P-101APCh-15 P-102APCh-15 P-103APCh-15 P-104APCh-15 P-105APCh-15 P-106APCh-15 P-107APCh-15 P-108APCh-15 P-109APCh-15 P-110APCh-15 P-111APCh-15 P-112APCh-15 P-113APCh-15 P-114APCh-15 P-115APCh-15 P-116APCh-15 P-117APCh-15 P-118APCh-15 P-119APCh-15 P-120APCh-15 P-121APCh-15 P-122APCh-15 P-123APCh-15 P-124APCh-15 P-125APCh-15 P-126APCh-15 P-127APCh-15 P-128APCh-15 P-129APCh-15 P-130APCh-15 P-131APCh-15 P-132APCh-15 P-133APCh-15 P-134APCh-15 P-135APCh-15 P-136APCh-15 P-137CPCh-15 P-138CPCh-15 P-139CPCh-15 P-140CPCh-15 P-141CPCh-15 P-142CPCh-15 P-143CPCh-15 P-1CRCh-15 P-2CRCh-15 P-3CRCh-15 P-4CRCh-15 P-5CRCh-15 P-6CRCh-15 P-7CRCh-15 P-8CRCh-15 P-9CRCh-15 P-10CRCh-15 P-11CRCh-15 P-12CRCh-15 P-13CRCh-15 P-14CRCh-15 P-15CRCh-15 P-16CRCh-15 P-17CRCh-15 P-18CRCh-15 P-19CRCh-15 P-20CRCh-15 P-21CRCh-15 P-22CRCh-15 P-23CRCh-15 P-24CRCh-15 P-25CRCh-15 P-26CRCh-15 P-27CRCh-15 P-28CRCh-15 P-29CRCh-15 P-30CRCh-15 P-31CRCh-15 P-32CRCh-15 P-33CRCh-15 P-34CRCh-15 P-35CRCh-15 P-36CRCh-15 P-37CRCh-15 P-38CRCh-15 P-39CRCh-15 P-40CRCh-15 P-41CRCh-15 P-42CR

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