BIOCHEMISTRY
PROPERTIES OF WATER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Water absorbs heat when it evaporates and forms a gas
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Water expands and becomes less dense when it freezes.
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Water molecules completely separate into ions in solutions.
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Water forms hydrogen bonds with ions and other polar substances.
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Detailed explanation-1: -That’s because cooling your body via sweating relies on a principle of physics called “heat of vaporization.” It takes energy to evaporate sweat off of your skin, and that energy is heat. As your excess body heat is used to convert beads of sweat into vapor, you start to cool down.
Detailed explanation-2: -The heat needed for the evaporation of water in sweat is taken from the tissues of the skin, reducing their temperature. Blood flowing through the skin is therefore cooled. This is an effective method of cooling the body because water has a high latent heat of vaporization.
Detailed explanation-3: -Humans (and other animals that sweat) use water’s high heat of vaporization to cool off. Water is converted from its liquid form to steam when the heat of vaporization is reached.
Detailed explanation-4: -Sweating is a useful cooling device for humans because a) water takes up a great deal of heat in changing from its liquid state to its gaseous state. Water has a high heat of vaporization, meaning it takes a lot of heat to change from liquid to gas. Sweat is a watery fluid that is released by glands in the skin.
Detailed explanation-5: -Your body sweats when it gets hot. The water on your skin evaporates into the air around it. It is the process of evaporation that creates cooler temperatures for your skin because of the endothermic process pulling the heat from the surrounding air to complete the evaporation process.