Chapter 2.2- Water Flashcards
What is the molecular formula of water?
H2O
What is each O-H covalent bond?
polar
What are the five properties of water?
-Water is sticky (adhesion and cohesion)
-Water moderates temperature
-Solid Water is less than dense than liquid water
-Water is a solvent
-Water can dissociate
What is surface tension?
Adhesion
Why is water adhesive and cohesive?
-Since it’s polar, it allows it to form hydrogen bonds with each other (cohesion) and with other atoms (adhesion)
How does water moderate temperature?
-Water has a high specific heat
-High heat of vaporization
How is solid more dense than liquid water?
-Solid (hydrogen bonds are stable)
-Liquid (hydrogen bonds constantly break and re-form)
How is water a solvent?
-It’s a “Universal” Solvent
-excellent solvent for polar and charged molecules and compounds
What is hydrophilic?
Water loving
Are molecules hydrophilic?
most biological molecules are hydrophilic
How do hydrophilic molecules work?
H2O forms a “hydration shell” around hydrophilic substance
In pure water, what are the numbers of H+ and OH-?
They are equal to each other
What does water dissociate to?
In pure water, small amounts can dissociate into hydrogen ions (H+) and hydroxide ion (OH-)
what pH?
the amount of H+ in solution, which measure the solutions acidity
How do the concentrations of H+ change?
They change by a factor of 10 for each unit of the scale
