Chem 241 - Study guides, Class notes & Summaries
Looking for the best study guides, study notes and summaries about Chem 241? On this page you'll find 124 study documents about Chem 241.
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Chem 241 Final Correct Answers Latest Update
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What's the reason for filtration in recrystalization - correct answers to remove insoluble impurities 
 
ortho and para are more stable why - correct answers because allow for tertiary carbocation 
 
when can you skip filtration during recryst. - correct answers if no insoluble impurities are present 
 
why warm filter tip pipets - correct answers to prevent premature crystalization 
 
why cant the solvent from a recrystallization be removed via evaporation instead of centrifugation? - correct ...
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CHEM 241 Exam 2 Correct answers latest update
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Goals of Separation - correct answers recovery of product, purity of product 
 
Types of Chromatography - correct answers Adsorption - SP: solid, MP: gas/liquid 
Partitioning - SP: liquid, MP: gas/liquid 
Ion-Exchange - SP: bonded anion/cation, MP: liquid 
Molecular Exclusion - SP: has pores, MP: liquid 
Affinity - SP: antigen/antibody interactions, MP: liquid 
Electrophoretic - no SP 
 
Solvent Extractions based on - correct answers Some solvents are not miscible; "like dissolves like"; less ...
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Chem 241 Exam 2 Correct Answers Latest Update
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Van Deemter Equation - correct answers 
 
A-term: multiple paths - correct answers - only affects packed columns 
- A term goes down with uniformly packed columns 
- smaller SP particles decrease A 
- no A term in OT because there are no particles 
 
A term band broadening - correct answers different particles take different paths with varying lengths and times to get out of column 
 
B term: longitudinal diffusion - correct answers - smaller molecules diffuse more than larger molecules 
- incr...
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Chem 241 Questions And Answers Latest Update
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What is a major safety concern for the griganrd lab - correct answers Et2O flammability 
 
What are two features of a good solvent - correct answers soluble at high temps, doesn't react with compound being purified 
 
Mixtures of two compounds will lead to what type of MP - correct answers lower and braoder 
 
___________ solvents will dissolve the substance when hot, but not when cold - correct answers crystalization 
 
What leads to larger, purer crystals - correct answers slow cooling 
 
How...
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Chem 241 Chromatography Questions And Answers Latest Update
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What are the benefits of having smaller particles in HPLC? - correct answers high efficiency, higher plate number, higher pressure, shorter run time, better resolution due to uniform flow (reduced A-term, multiple pathway) 
 
what is plate height? - correct answers length of column required for 1 equilibration of solute between mobile and stationary phases 
 
What are the drawbacks of having smaller particles in HPLC? - correct answers lower detection limit, resistance to solvent flow, increased...
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Chem 241 Lab Final Correct Answers Latest Update
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What was solvent-solvent extracted used for in experiment 1? - correct answers -to extract ethanol from alcoholic beverages (busch, busch light, and a non-alcoholic drink) 
 
Why can you not do a direct analysis on alcohol? - correct answers because it also contains carbs, proteins, and water and these things could interfere with the analysis 
 
How do you combat this problem (in exp 1)? - correct answers -isolate the compound of interest from the rest of the compounds in the sample 
 
what is a...
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Chem 241 Final Exam Correct answers latest update
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V1 - correct answers volume of phase 1 (phase being extracted) 
 
V2 - correct answers volume of phase 2 (phase doing the extracting) 
 
[S]1= - correct answers Q*m/v1 
 
[S]2= - correct answers (1-Q)*m/v2 
 
if [H+]> Ka - correct answers D=k 
 
if [H+]< Ka - correct answers D=0 
 
gas-gas chromatography - correct answers won't work because gases mix 
 
solid-solid chromatography - correct answers won't work because solids don't flow 
 
Velocity of solute - correct answers Vm* (1/1+K(Vs...
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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 Separations Correct Answers Latest Update
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solvent-solvent extraction - correct answers solute is partitioning between two layers based on solubility and polarity 
 
Partition coefficient K - correct answers [S]org/[S]aq 
 
q^n=(V1/(V1+KV2)^n - correct answers q-fraction of solute left in V1 
V1-volume of solvent being extracted 
V2-volume of solvent used to extract 
K-partition coefficient 
m-total moles of solute 
 
1 big extraction vs many small extractions - correct answers many small extractions are better than 1 small extraction 
 ...
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Chem 241 Exam 2: Chromatography Questions And Answers Latest Update 2024
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History of chromatography (ch 23) - correct answers -Greek word "chromatus" for color 
-Tswett (1903) first separated plant pigments 
 
Applications - correct answers Breast milk, water analysis, urinalysis for drug doping 
 
Goals of separation - correct answers Recovery of product, purity of product 
 
Type, SP, MP - correct answers 1. Adsorption: one polar substance sticks to another polar substance. Solid SP, gas or liquid MP 
2. Partition: dissolving of 2 similar liquids. Liquid SP, gas o...
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