Homework Answers
Retention time is the time a component spent in the chromatographic column during separation. Retention time depends on various factors such as
(a) Flow rate of carrier gas. Generally high flow rate decrease the retention time of a component as it will elute through the column first. But with increasing the flow rate decrease the separation.
(b) With increasing the temperature also retention time decrease as more component will be in gas phase.
(c) Column length also affects retention time. With increasing the column height retention time increase. Separation is also better in this case.
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11. What would happen to the retention time of a compound if the following changes were...
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...
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...
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
In fractional distillation with gas chromatography, what would happen to retention time if we (a. increase...
In fractional distillation with gas chromatography, what would happen to retention time if we (a. increase flow rate?) or (b. decrease molecular weights of components?)
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...
Fraction Distillation 1. Draw and explain phase diagram of a mixture of two miscible components in...
Fraction Distillation 1. Draw and explain phase diagram of a mixture of two miscible components in a solution. 2. Describe the following terms in gas chromatography a. Carrier gas b. Column packing 3. What would happen to retention time? a. If we increase flow rate b. Decrease molecular weights of components
Fraction Distillation Fraction Distillation 1. Draw and explain phase diagram of a mixture of two miscible...
Fraction Distillation Fraction Distillation 1. Draw and explain phase diagram of a mixture of two miscible components in a solution. 2. Describe the following terms in gas chromatography a. Carrier gas b. Column packing 3. What would happen to retention time? a. If we increase flow rate b. Decrease molecular weights of components
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
asap please thanks 9. Refer to the gas chromatograph (below) of a mixture of Compound A...
asap please
thanks
9. Refer to the gas chromatograph (below) of a mixture of Compound A (RT 1.11) and Compound B (RT-2.27), which was done on a general purpose column: START 51 1.10 227 RT AREA X000X TYPE ABHT AREAS 0.009 0.61 1.11 2.27 XX XX0X XX 55874 44.117 XXXX XX XX TOTAL AREAXX MUL FAC TOR-X Which compound has the highest retention time? b. Which compound is present in a larger amount assuming that their mass correction factors are...
based on your results what is the correlation between retention time and molar mass? • The...
based on your results what is the correlation between
retention time and molar mass?
• The lower the Urganic solvents. Put the 5 chemicals Doing Note that you do NOT need to pick compounds that adhere to a particular trend. These are the Pick 5 compounds from the through the simulator resha the nete open-ended to allow you to play with the program. Acetonitrile Chloroform Dichloromethane Diethyl ether Ethanol Isopropanol Heptane Hexane Methanol Pentane Toluene a) List your results here...
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...
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...
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 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...
Fraction Distillation 1. Draw and explain phase diagram of a mixture of two miscible components in a solution. 2. Describe the following terms in gas chromatography a. Carrier gas b. Column packing 3. What would happen to retention time? a. If we increase flow rate b. Decrease molecular weights of components
Fraction Distillation Fraction Distillation 1. Draw and explain phase diagram of a mixture of two miscible components in a solution. 2. Describe the following terms in gas chromatography a. Carrier gas b. Column packing 3. What would happen to retention time? a. If we increase flow rate b. Decrease molecular weights of components
asap please
thanks
9. Refer to the gas chromatograph (below) of a mixture of Compound A (RT 1.11) and Compound B (RT-2.27), which was done on a general purpose column: START 51 1.10 227 RT AREA X000X TYPE ABHT AREAS 0.009 0.61 1.11 2.27 XX XX0X XX 55874 44.117 XXXX XX XX TOTAL AREAXX MUL FAC TOR-X Which compound has the highest retention time? b. Which compound is present in a larger amount assuming that their mass correction factors are...
based on your results what is the correlation between
retention time and molar mass?
• The lower the Urganic solvents. Put the 5 chemicals Doing Note that you do NOT need to pick compounds that adhere to a particular trend. These are the Pick 5 compounds from the through the simulator resha the nete open-ended to allow you to play with the program. Acetonitrile Chloroform Dichloromethane Diethyl ether Ethanol Isopropanol Heptane Hexane Methanol Pentane Toluene a) List your results here...
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