Water - TRQ Flashcards
Aggregates of amphipathic molecules in water are called…
micelles
Buffers are mixtures of…
Weak acids and their conjugate bases
Entropy increases as substances…
Dissolve in water
HendersonHasselbach equation is…
pH = pKa + log (A-/HA)
Hydrophilic means…
Water-loving
Hydrophobic means…
Water-hating
Kw = 1 x 10^-14 M^2 at…
25ºC
Small changes in pH produces _____ changes in the rate of a process.
Large
As crystalline substances dissolve in water…
Entropy increases
At 25ºC, Kw always equals…
1 x 10^-14 M^2
Compounds that dissolve easily in water are ___ and ___.
Hydrophilic; polar
Compounds that do NOT dissolve easily in water are ___ and ___.
hydrophobic; nonpolar
Compounds that contain regions that are polar AND regions that are nonpolar are called…
Amphipathic
For all weak acids, when [HA] = [A-]…
pH = pKa
If two solutions differ in pH by 1 pH unit, that means that one solution has ____ than the other.
10 times the [H+]
If two solutions differ in pH by 2 pH unit, that means that one solution has ____ than the other.
100 times the [H+]
In the formation of a micelle, what regions are found on the exterior surface?
polar
In the formation of a micelle, what regions are sequestered in the interior?
nonpolar
Reactions in which the elements of water are added are called…
Hydrolysis
Reactions in which the elements of water are eliminated are called…
Condensation
The buffering region of an aqueous system occur…
Between pKa +/- 1
The ion product of water, Kw is equal to…
[H+][OH-]
The most stable structure of a macromolecule contains…
Maximized weak interactions
The most stable structure of a macromolecule is the…
Native structure
The stronger the tendency to dissociate a proton, the…
Stronger the acid
The stronger the tendency to dissociate a proton, the…
Lower the pKa
The sum of all the hydrogen bonds between H2O molecules allows liquid water to confer great internal…
Cohesion
The electronegative atoms that participate in hydrogen bonding include…
O, F, N
The normal pH of blood is…
7.4
The symbol p denotes…
-log
The type of forces that hold nonpolar regions of molecules together are called…
Hydrophobic interactions
Weak intermolecular forces between molecules as a result of inducing polarizing on one another are called…
Van der Waals interactions
What is the electron geometry of a water molecule?
Tetrahedral
What is the molecular geometry of a water molecule?
Bent
What type of solvent is water?
Polar
When the rate of the forward reaction equals the rate of the reverse reaction, the reaction is in…
Equilibrium
