Chapter 2.5: Properties of Water Flashcards
Define specific heat
the amount of heat that must be absorbed or lost by 1g of a substance to raise or lower its temperature 1° C
What is the amount of heat that must be absorbed or lost by 1g of a substance to raise or lower its temperature 1° C?
specific heat
What is the relationship between polarity and specific heat?
direct; more polar = higher specific heat
Why does a high specific heat allow for a constant internal temperature?
o Because organisms have a high water content, water’s high specific heat allows them to maintain a relatively constant internal temperature
Define heat of vaporization
the amount of energy required to change 1 g of a substance from a liquid to a gas
What is the amount of energy required to change 1 g of a substance from a liquid to a gas?
heat of vaporization
How does heat of vaporization facilitate cooling?
o The evaporation of water from a surface cools that surface
Why is ice less dense than water?
o Ice is less dense than liquid water because the hydrogen bonds in ice space the water molecules relatively far apart
Why is important that ice is less dense than water?
o This allows ice to float which is important because fish and other animals keep from freezing
Define hydrophobic
literally translates as “water-fearing’ and describes nonpolar substances that are not soluble in water
What literally translates as “water-fearing’ and describes nonpolar substances that are not soluble in water?
hydrophobic
Define hydrophilic
literally translates as “water-loving” and describes substances that are soluble in water
What is literally translates as “water-loving” and describes substances that are soluble in water?
hydrophilic
Define hydrophobic exclusion
the tendency of nonpolar molecules to aggregate together when place in water
What is the tendency of nonpolar molecules to aggregate together when place in water?
hydrophobic exclusion
