LABORATORY REVIEW
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It takes a lot of energy to increase the temperature of water.
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It takes a lot of energy for water to evaporate.
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Water molecules are cohesive and stick to the skin.
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Water is a good solvent so it can transport heat from the body.
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Detailed explanation-1: -How does that work? Water molecules are very good at forming hydrogen bonds, weak associations between the partially positive and partially negative ends of the molecules. Hydrogen bonding explains both the effectiveness of evaporative cooling (why sweating cools you off) and the low density of ice (why ice floats).
Detailed explanation-2: -Water is such a good coolant because it has a high specific heat capacity. Specific heat capacity is the ability to absorb heat without changing temperature. Thus, water absorbs heat easily, but changes temperature very slowly.
Detailed explanation-3: -The hydrogen bonds between water molecules cause the water to have a high heat capacity, meaning it takes a lot of added heat to raise its temperature. As the temperature rises, the hydrogen bonds between water continually break and form anew.
Detailed explanation-4: -Water has a high specific heat, meaning it takes more energy to increase the temperature of water compared to other substances.
Detailed explanation-5: -Water is a good coolant but because it can take heat energy away with it as it evaporates.-The cohesive property of water allows the molecules to stick together and from an unbroken, continuous column of water in the xylem of plants. Water is a polar molecule.