CHEM 241
Drexel University
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Chem 241 Acid/Base & Solvent/Solvent Extraction Questions And Answers Latest Update 2024
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Fraction of Dissociation - correct answers the fraction of the acid in the conjugate base form (A-). 
[A-] / [A-]+[HA] or [A-]/F 
 
Fraction of Association - correct answers the fraction of the base in the conjugate acid form [BH+]. 
[BH+] / [BH+]+[B] or [BH+]/F 
 
Strong Acids - correct answers HClO4, H2SO4, HNO3, HCl, HI, HBr 
 
Strong Bases - correct answers LiOH, NaOH, KOH, RbOH, CsOH 
Ca(OH)2, Mg(OH)2, Ba(OH)2, Sr(OH)2 
 
What should I do if I have a dilute strong acid or base? (10e-6<F...
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Organic Chemistry 241 Exam Questions And Answers Latest Update 2024
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If you add more than a minimum amount of ethanol when recrysallizing, how does that affect % recovery - correct answers Less crystals, % recovery decreases 
 
List 2 features of the mp of an impure compound - correct answers -Lower 
-Broad range 
 
List 2 features of the mp of a pure compound - correct answers -correct mp 
-narrow range 
 
2 Features of a good solvent for recrystallization - correct answers -insoluble at colder temps 
-soluble at hot temps 
-All impurities soluble at all temper...
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Organic Chemistry-CHEM 241- FA_ Questions And Answers Latest Update 2024
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Alkanes - correct answers - Single bond 
-Chemical structure- CnH2n+2 
 
First four alkanes - correct answers -Methane(CH4) 
-Ethane (c2H6) 
-Propane(C3H8) 
-Butane(C4H10) 
 
Alkenes and Alkynes - correct answers -contains double bonds 
 
Alkynes - correct answers -contains triple bonds 
 
Alcohols - correct
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Chem 241 Lab Final Exam Questions And Answers Latest Update 2024
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the importance of TMS (CH3)4Si - correct answers -TMS is extremely shielded (more so than most organics) 
-1 sharp spike at 0, due to 12 equivalent protons 
-chem. Inert 
-low BP, easily removed 
 
Beer's Law - correct answers A=abc 
A=absorbance 
a=molar absorptivity 
b=path length 
c=concentration 
know how to find c= 
if λ=max then a is constant 
if a standardized cuvette is used b is constant 
if A, b, and a are known, then c can be calculated, but only if all those criteria are met! 
(A ...
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Functional Groups Chem 241 Quiz 1 Questions And Answers Latest Update 2024
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alkane 
single bonds, sp3 carbons 
 
alkene 
double bond, sp2 carbons 
 
alkyne 
triple bond, sp carbons 
 
alcohol 
R-OH (hydroxy
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Chem 241 Midterm 2 Questions And Answers Latest Update 2024
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what are the two forms of hydrogen and how can we determine which it is within a bond? - correct answers Hydrogen can either be acidic (+) or hydridic (-). we can determine which it is in a certain bond by looking at the dipole and electronegativity of both atoms. 
 
what is an anion? - correct answers an atom with more electrons and a negative charge 
 
what is a cation? - correct answers an atom with less electrons (missing some) and a positive charge 
 
describe the radius of neutral atoms, c...
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Chem 241 Exam 4 Questions And Answers Latest Update 2024
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oxidation - correct answers loss of electrons 
 
reduction - correct answers gain of electrons 
 
current - correct answers the greater the voltage, the more _____ will flow 
 
galvanic - correct answers _____ cell uses spontaneous chemical reaction to generate electricity 
 
salt bridge - correct answers _____ ____ maintains electroneutrality throughout the cell 
 
calomel, silver silver chloride - correct answers Two reference electrodes _____ using KCl and ____ ____ _____ using AgCl and KCl
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UNC Chem 241 FINAL Questions And Answers Latest Update 2024
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Increase N - correct answers 1) Increase length of column 
2) Optimize flow rate (Ux) to minimize H 
3) Smaller packing bead diameter, uniform packing (A-term) 
4) Thinner SP layer (less C term) 
5) Open Tubular Liquid Chromo (No A) (A: more sensitive & resolution, fit more plate (N) shorter analysis D: small capacity) 
 
Absorption Chromatography - correct answers SP: Solid 
MP: Liquid or Gas 
Solutes move at different rates according to the forces of attraction to the stationary phase 
 
Parti...
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CHEM 241 Final (Prelab Questions) Questions And Answers Latest Update 2024
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If you are unsure which layer of your separatory funnel is the organic layer and which is the aqueous layer, which of these is the safest way to figure it out? - correct answers Add a few drops of water to each layer to see if the water mixes in (aqueous layer) or forms a separate layer (organic) 
 
How do you know when you have used a sufficient amount of sodium sulfate? - correct answers When some of the sodium sulfate is powdery or free flowing 
 
When should you throw out the layer from the ...
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Chem 241 Exam 2: Analytical Separations Questions And Answers Latest Update 2024
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Extraction - correct answers The physical transfer of a solute from one phase to another 
 
Goals of separation - correct answers 100% recovery and 100% purity 
 
Precipitation - correct answers Liquid to solid 
 
Solvent-solvent extraction - correct answers Solvent 1 to solvent 2 
 
Distillation - correct answers Liquid to gas 
 
Sublimation - correct answers Gas to solid 
 
Distribution constant: KD= - correct answers [S]org/[S]aq 
 
Which phase is on top: aqueous or organic? - correct answers...
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