CHEM 241
Drexel University
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Chem 241 Goldman Final Questions And Answers Latest Update 2024
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lab 7: what sort of condenser should you use and why? - correct answers a water condenser instead of an air condenser because it is better at preventing your solvent and or products from evaporating 
 
how can you reduce the health risk of silica gel? - correct answers keep it wet with solvent so less powder gets in the air, handle the gel in the fume hood, I'm some gel spills wipe it with a wet paper towel, wear PPE 
 
What is true about mixing liquids in a separatory funnel? - correct answers...
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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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Chem 241 Lab 1 Questions And Answers Latest Update 2024
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How do you extract the amine - correct answers 1. Dissolve in ether 
2. add HCl to make amine soluble in water (not ether) 
3. Extract aqueous layer 
4. add NaOH 
5. collect precipitate 
 
What layer will the amine be found in (ether/ aqueous) - correct answers aqueous 
 
Which layer is the aqueous layer - correct answers bottom 
 
which layer is the ether layer - correct answers top 
 
how can you tell which liquid will be which layer - correct answers density 
 
how do you extract the amine - ...
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Chem 241 UNC Exam 2 Correct Answers Latest Update
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Extraction - correct answers Transfer of a solute from one phase to another 
 
Eluent - correct answers Fluid entering the column 
 
Partition Chromatography - correct answers Separation based on solute dissolving into stationary liquid 
 
Ion-Exchange Chromatography - correct answers Separation based on charge, stationary phase is made of either negatively or positively charged beads 
 
Size Exclusion Chromatography - correct answers Separation based on molecular size, larger molecules elute fi...
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CHEM 241 Spectroscopy Exam Study Guide Correct Answers Latest Update
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How do transmittance, absorbance, and molar absorptivity differ? Which one is proportional to concentration? - correct answers *transmittance* = (P/P0) 
 
*absorbance* = log(T) 
 
absorbance is proportional to concentration 
 
Why is it most accurate to measure absorbances in the range A = 0.3-2? - correct answers If absorbance is too high, too little light reaches the detector for accurate measurement 
 
If absorbance is too low, there is too little difference between sample and reference for a...
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Chem 241 Exam 1 Practice Test Correct Answers Latest Update
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Crystalline solids have what? - correct answers have highly ordered structures 
 
In liquids, the active IMF are...? - correct answers strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other 
 
In which of the following molecules is H bonding likely to be the most significant component of the total IMF? - correct answers CH3OH 
 
What substance has London only? - correct answers Kr 
 
What substance has dispersion only as its ...
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Chem 241 Lab Exam 1 Correct Answers Latest Update
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A. Will your compound be more soluble in hot or cold solvent? - correct answers It will be more soluble in hot solvent because increasing temperatures increases molecular movement, causing more collisions between the water molecules and the solid compound. 
 
B. You have a solution of NaCl and water. You heat the solution to boiling and observe bubbles forming in the solution, and vapor escaping the flask. What is the identity of the bubbles and the vapor? - correct answers The bubbles is the wa...
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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 UNC Final Correct Answers Latest Update
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Extraction - correct answers Transfer of a solute from one phase to another 
 
Eluent - correct answers Fluid entering the column 
 
Partition Chromatography - correct answers Separation based on solute dissolving into stationary liquid 
 
Ion-Exchange Chromatography - correct answers Separation based on charge, stationary phase is made of either negatively or positively charged beads 
 
Size Exclusion Chromatography - correct answers Separation based on molecular size, larger molecules elute fi...
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Chem 241 Exam 3 Correct Answers Latest Update
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What are the wavelengths of visible light? - correct answers 400 - 800 nm 
 
How do X-Rays affect electrons? - correct answers Electronic Transitions of Core Electrons (Breaks chemical bonds and ionizes molecules) 
 
How does UV- VIS affect electrons? - correct answers Electronic Transitions of Valence Electrons (Vibrational + Rotational as well) 
 
How does IR affect electrons? - correct answers Vibrational Transitions (Rotational as well) 
 
How do Microwave waves affect electrons? - correct a...
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