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Which of the following statements is correct for gas
chromatography for chiral molecules
Which of the...
Each of the following statements describes a type of column chromatography. Sort the statements to the...
Each of the following statements describes a type of column chromatography. Sort the statements to the type of chromatography they describe. If a statement can describe all of the types, place that statement in the "All" category. (Note that size-exclusion chromatography may also be called gel-filtration or molecular exclusion chromatography.) Categories: Size-exclusion Chromatography, Affinity Chromatography, Ion-exchange Chromatogrpahy, and All Statements: Separate molecules by size. Separate molecules by charge. The stationary phase has a covalently bound group to which a protein...
Select the correct characteristics describing normal-phase and reversed-phase chromatography. Normal-phase chromatography Reversed-phase chromatography (a) Polarity of...
Select the correct characteristics describing normal-phase and reversed-phase chromatography. Normal-phase chromatography Reversed-phase chromatography (a) Polarity of phases: Stationary phase is polar Stationary phase is non polar b) Eluent strength of solvent. Increases as solvent becomes more polar. Increases as solvent becomes less polar c) Nature of solutes. Polar Non-polar d) Nature of solute interaction. More soluble in mobile phase as the polarity of the mobile phase increases. More soluble in mobile phase as the polarity of the mobile phase decreases....
Which out of the following can be used as a stationary phase in Gas Chromatography? Oheptane...
Which out of the following can be used as a stationary phase in Gas Chromatography? Oheptane helium alumina carbowax Question 30 (3 points) Which is not a correct mechanistic intermediate of the para bromination of phenol? OH Br OH BA Question 32 (3 points) At the end of an experiment, there is some left over 4-chlorophenol. It has the empirical formula C3H30Ci , a melting point of 45 °C, and a boiling point of 217 ° C. Into which waste...
Question 1 Which of the following is the advantage of straight packed column? Selected Answer: It...
Question 1 Which of the following is the advantage of straight packed column? Selected Answer: It can be repacked easily Answers It can be packed uniformly It can be repacked easily It is compact It is easier to heat it evenly Question 2 Which of the following statements most accurately describes thin-layer chromatography? Selected Answer: technique used to separate non-volatile mixtures, the mobile phase has different properties from the stationary phase. Answers The mobile phase is the solvent also called...
Chromatography Basics Multiple Choice: Answer the following multiple choice questions about Chromatography Basics (SHOW WORKING): 1) In...
Chromatography Basics Multiple Choice: Answer the following multiple choice questions about Chromatography Basics (SHOW WORKING): 1) In a given chromatographic column, A) different solutes behave as if there are a different number of theoretical plates for each. B) the number of theoretical plates is the same for all solutes. C) efficiency is improved by increasing plate height. 2) What useful information can be found from a Van Deemter plot? A) The selectivity factor B) Optimum mobile phase flow rate C) Optimum...
Which of the following statements regarding thin layer chromatography are TRUE? Partition chromatography separates compounds based...
Which of the following statements regarding thin layer chromatography are TRUE? Partition chromatography separates compounds based on how they distribute themselves between the stationary and mobile phases. In thin layer chromatography, a polar organic compound will be attracted to the adsorbent and therefore travel further up the plate than a non-polar compound The Rf value is independent of the adsorbent material used. In thin layer chromatography, a polar organic compound will be repelled by the adsorbent and therefore travel not...
Table 2: Alcohol and Ketone Standards GC Retention Times GC#: Retention time Alcohol Standard Mixture Phent...
Table 2: Alcohol and Ketone Standards GC Retention Times GC#: Retention time Alcohol Standard Mixture Phent ion= 2.05Smin low Peak 1 Compound Name: athanol Rapesnal utanal aclapeatanal 4.755min oilng 6.895min .230 min Peak 2 Compound Name: Peak 3 Compound Name: Peak 4 Compound Name: GC#:1 Ketone Standard Mixture Retention time 2.575un Peak 1 Compound Name: Acclono Butanon a Pentanone 2tHex anon Peak 2 Compound Name: min Peak 3 Compound Name: 615 min 1D. 307 min Peak 4 Compound Name: Part...
Which of these are optically active? : 7 answers Which of these have NO chiral centers...
Which of these are optically active?
: 7 answers
Which of these have NO chiral centers
:5 answers
Which of these have chiral centers but are NOT optically
active?
:4 choices
Question 16 1 pus =O O < BI BI F ОН HO J CI ОН Р OHN Look at the given organic molecules. Fill in the blanks with the single letter code of the appropriate structure, or the appropriate descriptive vocabulary word/phrase/value for non-structures to complete the reaction and...
Someone please help me with this problem Enantiomers have very similar physical properties, while for diastereomers...
Someone please help me with this problem
Enantiomers have very similar physical properties,
while for diastereomers they can be very different. This fact is
important in the separation or resolution of enantiomers. In the
lecture, we looked at how chiral chromatography is used to separate
enantiomers: first, by reacting them with an optically pure chiral
reagent (i.e., pure R or S) to form a pair of diastereomers, then
separating them using chiral chromatography, and finally detaching
the chiral reagent to...
Question 7 of 20 Classification of Gas and Liquid chromatography can be based on? OO A....
Question 7 of 20 Classification of Gas and Liquid chromatography can be based on? OO A. Based on the mobile phase O B. Shape of the chromatographic bed OC. All the answers are correct OD. Based on whether the stationary phase is derivatized
Select the correct characteristics describing normal-phase and reversed-phase chromatography. Normal-phase chromatography Reversed-phase chromatography (a) Polarity of phases: Stationary phase is polar Stationary phase is non polar b) Eluent strength of solvent. Increases as solvent becomes more polar. Increases as solvent becomes less polar c) Nature of solutes. Polar Non-polar d) Nature of solute interaction. More soluble in mobile phase as the polarity of the mobile phase increases. More soluble in mobile phase as the polarity of the mobile phase decreases....
Which out of the following can be used as a stationary phase in Gas Chromatography? Oheptane helium alumina carbowax Question 30 (3 points) Which is not a correct mechanistic intermediate of the para bromination of phenol? OH Br OH BA Question 32 (3 points) At the end of an experiment, there is some left over 4-chlorophenol. It has the empirical formula C3H30Ci , a melting point of 45 °C, and a boiling point of 217 ° C. Into which waste...
Question 1 Which of the following is the advantage of straight packed column? Selected Answer: It can be repacked easily Answers It can be packed uniformly It can be repacked easily It is compact It is easier to heat it evenly Question 2 Which of the following statements most accurately describes thin-layer chromatography? Selected Answer: technique used to separate non-volatile mixtures, the mobile phase has different properties from the stationary phase. Answers The mobile phase is the solvent also called...
Table 2: Alcohol and Ketone Standards GC Retention Times GC#: Retention time Alcohol Standard Mixture Phent ion= 2.05Smin low Peak 1 Compound Name: athanol Rapesnal utanal aclapeatanal 4.755min oilng 6.895min .230 min Peak 2 Compound Name: Peak 3 Compound Name: Peak 4 Compound Name: GC#:1 Ketone Standard Mixture Retention time 2.575un Peak 1 Compound Name: Acclono Butanon a Pentanone 2tHex anon Peak 2 Compound Name: min Peak 3 Compound Name: 615 min 1D. 307 min Peak 4 Compound Name: Part...
Which of these are optically active?
: 7 answers
Which of these have NO chiral centers
:5 answers
Which of these have chiral centers but are NOT optically
active?
:4 choices
Question 16 1 pus =O O < BI BI F ОН HO J CI ОН Р OHN Look at the given organic molecules. Fill in the blanks with the single letter code of the appropriate structure, or the appropriate descriptive vocabulary word/phrase/value for non-structures to complete the reaction and...
Someone please help me with this problem
Enantiomers have very similar physical properties,
while for diastereomers they can be very different. This fact is
important in the separation or resolution of enantiomers. In the
lecture, we looked at how chiral chromatography is used to separate
enantiomers: first, by reacting them with an optically pure chiral
reagent (i.e., pure R or S) to form a pair of diastereomers, then
separating them using chiral chromatography, and finally detaching
the chiral reagent to...
Question 7 of 20 Classification of Gas and Liquid chromatography can be based on? OO A. Based on the mobile phase O B. Shape of the chromatographic bed OC. All the answers are correct OD. Based on whether the stationary phase is derivatized
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