AP BIOLOGY

BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The evaporation of water from off the surface of the skin helps to cool the organism. Which property of water allows such?
A
Specific heat capacity
B
High latent heat of vaporisation
C
High latent heat of fusion
D
Unusual Density
Explanation: 

Detailed explanation-1: -The cooling effect of water is due to water having a high specific heat. this high specific heat allows water to absorb excessive amounts of energy without a change in temperature.

Detailed explanation-2: -Likewise, the high latent heat of vaporization (see below), indicates that when water vapor (derived from evaporation of water at the ocean’s surface driven by solar energy receipt at low latitudes) condenses into liquid droplets at high elevations or high latitude, the latent heat is released into the environment.

Detailed explanation-3: -Water has high heat of vaporization. Humans (and other animals that sweat) use water’s high heat of vaporization to cool off.

Detailed explanation-4: -It is expressed as kg/mol or kJ/kg. When a material in liquid state is given energy, it changes its phase from liquid to vapor; the energy absorbed in this process is called heat of vaporization. The heat of vaporization of water is about 2, 260 kJ/kg, which is equal to 40.8 kJ/mol.

Detailed explanation-5: -The energy required to break multiple Hydrogen bonds causes water to have a high heat of vaporization. A large amount of energy is needed to convert liquid water, where the molecules are attracted through their hydrogen bonds, to water vapor, where they are not.

There is 1 question to complete.