Ch 3 Flashcards
What percentage of the human body is water?
60-70%
What properties of water make it special?
Its polar covalent bonding and hydrogen bonds between molecules
Special properties of water
High heat capacity and heat of vaporization, dissociation into ions that lead to generating pH, co and adhesion
Water has a net charge
False
Hydrogen is slightly positive and oxygen is slightly negative.
True
Hydrophilic
Polar substance that dissolves in water
Hydrophobic
Nonpolar molecules like oils and fats that do not interact with water
Hydrogen bonds are broken by _________ ______ as heat _______
Kinetic energy; rises
_____ is lower density than _____ because of _____ bonds
Ice; water; hydrogen
High heat of vaporization
Amt of E required to change one gram of liquid to gas
Water has a low heat of vaporization
False; high heat of vaporization
Water is a _____ because it is ______ .
Solvent; polar
Cohesion
Water molecules are attracted to eachother due to h bonds
________ is why water forms a dome like shape
Cohesion
Adhesion
The attraction of water and other molecules
Water molecules “climbing” up a capillary tube
Adhesion
Low levels of hydrogen ions is
High pH, basic
High concentrations of H ions is
Low pH, acidic
Buffers
Absorb excess H+ or OH- to keep pH optimal in the body
Carbonic acid
If there is too much OH-, it combines with it to create bicarbonate, lowering the pH
Specific heat
Amount of heat gained or lost to change the temperature of one gram of substance by 1C
Why does water absorb a lot of heat before its temperature rises?
Hydrogen bonds absorb the heat increase
