a44 - temperature is equal to 540 calories/g . This is...

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Changes of Physical State When the physical state of a substance is changed, heat is either absorbed or liberated but the temperature remains constant . The heat required to melt ice without any increase in the temperature of the system is equal to 80 calories/g . This is called the heat of fusion and it relates to the energy needed to break the hydrogen-bonds that are holding the water molecules together in the solid state. The heat required to boil water without an increase in
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Unformatted text preview: temperature is equal to 540 calories/g . This is called the heat of vaporization and it relates to the energy needed to break the hydrogen-bonds holding the water molecules together in the liquid state. The energy of a hydrogen-bond in water is about 5% of the energy of the hydrogen-oxygen chemical bond energy. Although the energy of the hydrogen-bond is small it has a significant effect on the amount of energy that is required to melt ice or boil water....
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