Chem/Phys Concentrated Flashcards
(56 cards)
Pouseuille’s Equation (Flow)
Flow = ΔPπr^4 / 8Lη
η = Viscosity
Radius to the 4th power
Relative reactivities of Carboxylic Acid Derivatives
acyl halides > anhydrides > esters and acids > amides.
Alpha Decay
Emit an alpha particle, He nucleus
Beta+ Decay vs. Beta- Decay
Beta+ = Positon emit, proton–>neutron
Beta- = Electron emit, neutron–>proton
Field Strength Equation
β = µI/2r I = current r = radius µ = permeability of space constant
Standing wave equation
Fixed string
f = v/2L
L = length v = velocity f = frequency
Gram equivalent weight
Mass per acidic proton
= (Total mass) / (#protons)
When is fractional distillation used?
When compounds boiling points are within 25 degrees Celsius
Ethers -OR (-OCH3) are electron (donating/withdrawing)
Donating!
Carboxylic acids are withdrawing
if attached by O-C or N-H or C-H it is donating, if attached by C-O or N-O it is withdrawing
Rules for ∆G = ∆H - T∆S
For ∆S sign look at whether the reactants or products are more or less disordered. Positive ∆S = Decrease in organization
Homotropic regulation
Substrate AND modifier
Account for cooperativity!
Sigmoidal shape in Hb binding curve for oxygen
Positive control
Not exposed to experimental treatment but to some other treatment which produces the expected effect
(to make sure it can happen)
Negative control
A control group that is not exposed to experimental treatment –> No effect is expected
Suloxide group
R-(S=O)-R’
Thioketone
R-(C=S)-R’
Half life problem: 93% degraded in 100 minutes, what is approximate half life
0.5^4 = 6.25% ~ 7%
Therefore 4 half lives in 100 minutes, so half life = 25 minutes
Ka to pKa shortcut
4*10^5
= (5-1).(10-4) = 4.6
Osmotic Pressure equation
п = MRT п = Osmotic pressure M = Osmolarity of ALL IONS (sometimes can be given) R = 8.314 J/mol/K T = 273.15 K
Does elemental nitrogen undergo hydrolysis?
N2 is INERT dammit, nothing happens to that fucker
Hydrolysis of carbon dioxide forms___
Carbonic Acid (addition of OH to CO2) Will lower pH of water
Can a nitrogen be part of an amide AND an amine
Yes. It can be both depending on the R groups
R S L and D
R and S absolute
L and D relative
Galvanic cells consist of a maximum of ____ half reactions, so given more reduction potentials you should only use _____
2 half reactions
Only use the two that are involved in the cell reaction
What is STP
273K or 0 Celsius
1 atm pressure
