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Ch.11 - Liquids and Intermolecular Forces
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.11 - Liquids and Intermolecular ForcesProblema 83a
Capitolo 11, Problema 83a

(a) When you exercise vigorously, you sweat. How does this help your body cool?

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Understand that sweating is a part of the body's thermoregulation process, which helps maintain a stable internal temperature.
Recognize that when you exercise, your body generates heat, increasing your internal temperature.
Sweat glands in your skin release sweat, which is primarily composed of water, onto the surface of your skin.
As the sweat evaporates from your skin, it absorbs heat from your body, which cools you down. This process is known as evaporative cooling.
The heat required for the evaporation of sweat is taken from your body, thus lowering your body temperature and helping you cool down.

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Evaporation and Cooling

Evaporation is the process where liquid turns into vapor, which requires energy. When sweat evaporates from the skin's surface, it absorbs heat from the body, leading to a cooling effect. This is a crucial mechanism for thermoregulation, helping to maintain a stable internal body temperature during vigorous exercise.
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Filtration and Evaporation

Thermoregulation

Thermoregulation is the process by which the body maintains its core internal temperature. During exercise, the body generates heat, and to prevent overheating, it activates mechanisms like sweating. This physiological response is vital for sustaining performance and preventing heat-related illnesses.

Role of Sweat Glands

Sweat glands are specialized structures in the skin that produce sweat, primarily composed of water and electrolytes. When the body temperature rises, these glands are stimulated to release sweat onto the skin's surface. The evaporation of this sweat is essential for effective cooling, as it helps dissipate excess heat generated during physical activity.
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Use the normal boiling points propane (C3H8) -42.1 °C butane (C4H10) -0.5 °C pentane (C5H12) 36.1 °C hexane (C6H14) 68.7 °C heptane (C7H16) 98.4 °C to estimate the normal boiling point of octane (C8H18). Explain the trend in the boiling points.

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(b) A flask of water is connected to a vacuum pump. A few moments after the pump is turned on, the water begins to boil. After a few minutes, the water begins to freeze. Explain why these processes occur.

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