Which of the following are attributes that affect the retention time of a given compound for...
Which of the following are attributes that affect the retention time of a given compound for Gas Chromatography: (select all that apply)
Aroma
Polarity
Volatility
Column Temperature
Homework Answers
The factors that affect the retention time in gas chromatography are
1)polarity - more polar molecule will have higher boiling temperature so it will have lesser tendency to stay in gas phase so they have longer retention time
2) higher the temperature of the column lesser will be retention time as more components will stay in gas phase
3) volatility:more the volatility of the components lesser will be boiling temperature so more components will be in gas phase so retention time will be less
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Which of the following are attributes that affect the retention
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What would happen to the retention time of a compound if the following changes were made?...
What would happen to the retention time of a compound if the following changes were made? Decrease the flow rate of the carrier gas Increase the temperature of the column Increase the length of the column How do the temperature and flow rate of the carrier gas affect the separation of two compounds that have been shown to separate by GC? 5. Rank the following compounds in terms of expected retention times on a non-polar GC Column TOH OCH.CH MW-114...
11. What would happen to the retention time of a compound if the following changes were...
11. What would happen to the retention time of a compound if the following changes were made? Decrease the flow rate of the carrier gas. а. Increase the temperature of the column Increase the length of the column b. с.
11. What would happen to the retention time of a compound if the following changes were made? Decrease the flow rate of the carrier gas. а. Increase the temperature of the column Increase the length of the column b. с.
7. What is the effect of the following on retention time seen in the GC? a....
7. What is the effect of the following on retention time seen in the GC? a. Increase in flow rate of carrier gas Increase in the temperature of the column b. c. Increasing the polarity of the column
A number of factors determine the rate at which a given compound travels through a gas chromatograph. List two of t...
A number of factors determine the rate at which a given compound travels through a gas chromatograph. List two of these factors: The period following injection that is required for a compound to pass through the column is called the What would happen to the retention time of a compound if the following changes were made? Decrease the flow rate of the carrier gas Increase the temperature of the column Increase the length of the column How do the temperature...
Lab #2: Gas Chromatography Theory behind gas chromatography What do all types of chromatography share in...
Lab #2: Gas Chromatography Theory behind gas chromatography What do all types of chromatography share in common? Relationship between retention time and boiling point/vapor pressure How changing parameters affect the retention time Ramp rate Temperature Length of column Pressure Whether column is packed or unpacked
Table 2: Alcohol and Ketone Standards GC Retention Times GC#: Retention time Alcohol Standard Mixture Phent...
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8. The recording paper is moving at the rate of 2.0 in./min. What are the retention...
8. The recording paper is moving at the rate of 2.0 in./min. What are the retention times of the peaks that appear at: a) 12.0 in b) 2.5 cm 7. What is the effect of the following on retention time seen in the GC? a. Increase in flow rate of carrier gas Increase in the temperature of the column b. c. Increasing the polarity of the column 8. The recording paper is moving at the rate of 2.0 in./min. What...
looking for a check of my work, is this correct? if not please let me know....
looking for a check of my work, is this correct? if not please
let me know. thanks!
1. (23 Total Points) Gas Chromatography a. (5 pts) Circle the BEST answer for the question below. Of the compounds listed below, which would you expect to eluto last from a nonpolar gas chromatographic column? 3 • n-Propanol (CH3CH2CH2OH) Polar Polar = 7* (mPoland 1. Methanol (CH3OH) Polar NON-Polar = 2nd 4. n-Butanol (CH3CH2CH2CH2OH) ВР 1st Low C . n-Pentanol (CH3CH2CH2CH2CH2OH) and Higher...
10000 page 6 9.10 Two chromatograms are shown. Both chromatograms show the separation of the same...
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On a silica gel column, a compound was found to have a retention time of 28 min when the mobile phase was toluene. Which solvent, carbon tetrachloride or chloroform, would be more likely to shorten th...
On a silica gel column, a compound was found to have a retention time of 28 min when the mobile phase was toluene. Which solvent, carbon tetrachloride or chloroform, would be more likely to shorten the retention time? Explain.
What would happen to the retention time of a compound if the following changes were made? Decrease the flow rate of the carrier gas Increase the temperature of the column Increase the length of the column How do the temperature and flow rate of the carrier gas affect the separation of two compounds that have been shown to separate by GC? 5. Rank the following compounds in terms of expected retention times on a non-polar GC Column TOH OCH.CH MW-114...
11. What would happen to the retention time of a compound if the following changes were made? Decrease the flow rate of the carrier gas. а. Increase the temperature of the column Increase the length of the column b. с.
11. What would happen to the retention time of a compound if the following changes were made? Decrease the flow rate of the carrier gas. а. Increase the temperature of the column Increase the length of the column b. с.
7. What is the effect of the following on retention time seen in the GC? a. Increase in flow rate of carrier gas Increase in the temperature of the column b. c. Increasing the polarity of the column
A number of factors determine the rate at which a given compound travels through a gas chromatograph. List two of these factors: The period following injection that is required for a compound to pass through the column is called the What would happen to the retention time of a compound if the following changes were made? Decrease the flow rate of the carrier gas Increase the temperature of the column Increase the length of the column How do the temperature...
Lab #2: Gas Chromatography Theory behind gas chromatography What do all types of chromatography share in common? Relationship between retention time and boiling point/vapor pressure How changing parameters affect the retention time Ramp rate Temperature Length of column Pressure Whether column is packed or unpacked
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...
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looking for a check of my work, is this correct? if not please
let me know. thanks!
1. (23 Total Points) Gas Chromatography a. (5 pts) Circle the BEST answer for the question below. Of the compounds listed below, which would you expect to eluto last from a nonpolar gas chromatographic column? 3 • n-Propanol (CH3CH2CH2OH) Polar Polar = 7* (mPoland 1. Methanol (CH3OH) Polar NON-Polar = 2nd 4. n-Butanol (CH3CH2CH2CH2OH) ВР 1st Low C . n-Pentanol (CH3CH2CH2CH2CH2OH) and Higher...
10000 page 6 9.10 Two chromatograms are shown. Both chromatograms show the separation of the same mixture using the same chromatography column with the same flow rate, but under different conditions Chromatogram #1 Chromatogram #2 compound (a) If the chromatograms were obtained by gas chromatography, which one used the higher column temperature? Explain briefly, showing that you understand the effect of temperature on retention in gas chromatography (b) If the chromatograms were obtained by liquid chromatography, which one used the...
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