Homework Answers
When the valve is in the load position,
the fixed volume sample loop is washed and loaded with fresh sample from
a syringe. Excess from the washings is sent to the waste. To inject the
contents of the sample loop, the valve is rotated 60° counterclockwise.
In the inject position, solvent under high pressure, flowing from the
pump to the column, pushes the contents of the sample loop towards the
column. The reproducibility of injections made using the injection valve
and fixed volume loop is very good.
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Shown below is an injection valve used in high-performance liquid chromatography. Correctly label the valve that...
Electrospray time‑of‑flight (TOF) mass spectrometry was used to analyze the eluate from a high‑performance liquid chromatography...
Electrospray time‑of‑flight (TOF) mass spectrometry was used to analyze the eluate from a high‑performance liquid chromatography (HPLC) separation. The mass spectrum of one chromatographic peak, containing a protein of unknown molecular mass, displays MHnn+ peaks at m/z= 6636.908, 6194.524, 5807.480, 5465.932, 5162.360, and 4890.726. Find the average molecular mass (M) of the neutral protein and its standard deviation.
Electrospray time‑of‑flight (TOF) mass spectrometry was used to analyze the eluate from a high‑performance liquid chromatography...
Electrospray time‑of‑flight (TOF) mass spectrometry was used to analyze the eluate from a high‑performance liquid chromatography (HPLC) separation. The mass spectrum of one chromatographic peak, containing a protein of unknown molecular mass, displays MHn+n peaks at m/z= 6710.365, 6263.085, 5871.757, 5526.428, 5219.496, and 4944.856. Find the average molecular mass (M) of the neutral protein and its standard deviation.
A vapor-compression refrigeration system which operates on the cascade cycle arrangement shown below is used to obtain refrigeration at a low temperature. Refrigerant-12 is the working fluid in the h...
A vapor-compression refrigeration system which operates on the cascade cycle arrangement shown below is used to obtain refrigeration at a low temperature. Refrigerant-12 is the working fluid in the high-temperature cycle and Refrigerant-13 is used in the low-temperature cycle. For the Refrigerant 13 cycle, the working fluid enters the compressor as saturated vapor at -30°F and is compressed isentropically to 250 lbf/in2. Saturated liquid leaves the intermediate heat exchanger at 250 lbf/in2 and enters the expansion valve. For the Refrigerant...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography?...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
2. The structure of the commonly used organic solvent dimethylformamide (DMF) is shown below. The numbers...
2. The structure of the commonly used organic solvent dimethylformamide (DMF) is shown below. The numbers by each carbon atom are shown to distinguish each C atom in the molecule. Using Valence Bond Theory, answer the questions in parts a) and b). (4 pts) o: н LH H) N )H -Co HIH Dimethylformamide a) Specify the hybrid orbitals for each atom in the molecule indicated below C 2): N: C(1): b) Identify the bond type(s) and the overlapping orbitals of...
A battery of cylindrical membranes shown below is used for an extractive bioconversion. Extractive bloconversion means...
A battery of cylindrical membranes shown below is used for an extractive bioconversion. Extractive bloconversion means that fermentation and extraction of product occur at the same time. inner tube product) annular space A 10% glucose in water solution is passed through the annular space at a rate of 70 kg/h. An organic solvent enters the inner tube at a rate of 50 kg/h which cannot penetrate the membrane. On the other hand, glucose and water do not enter the inner...
(100 points) Figure below shows the schematic diagram of a two-stage cascade refrigeration system (also called...
(100 points) Figure below shows the schematic diagram of a two-stage cascade refrigeration system (also called the Economizer 2-Stage Refrigeration Cycle). Comparing to the cascade two-stage refrigeration system discussed in In-class Activity #10a, in this case, the flash chamber (now called Flash Intercooler) is still used but the mixing chamber is removed. The superheated vapor (2) out of the low-pressure compressor (1) is routed into the flash chamber, and the saturated vapor (3) out of the flash chamber enters directly...
what is the prediction of the unknown amino acids mixture based on the strip from thin layer chromatography sheet? The unknown mixtures can be ala plus asp, ala plus asp plus lys, lys plus asp or ala...
what is the prediction of the unknown amino acids mixture
based on the strip from thin layer chromatography sheet?
The unknown mixtures can be ala plus asp, ala plus asp plus
lys, lys plus asp or ala plus lys.
anion exchange resin was used
Tubes 2,3, 6 and 7 had a spot appear that was light pink
We were unable to transcribe this imageWe were unable to transcribe this imageH-) to the column followed by a sufficient amount of the...
5. When all of the sample to be collected has left the column, will the drop...
5. When all of the sample to be collected has left the
column, will the drop of solution coming off the tip of the column
be acidic, basic or neutral?
6. How many H+ ions would be displaced from the ion
exchange column by 1 Cu2+ ion?
7. Binding sites on the ion exchange resin are saturated
with which ion before the sample solution is added?
8. Ions are displaced from the resin binding sites by
any ion that has...
All work must be shown. That is, you need to show the steps and calculations you used to arrive at every answer for credit - For example, I need to see which two numbers you divided to arrive...
All work must be shown. That is, you need to show the steps and calculations you used to arrive at every answer for credit - For example, I need to see which two numbers you divided to arrive at a particular S? value, F-ratio value, etc. The "Pygmalion Effect" refers to the effect of teacher expectations on student academic achievement and performance (for the classic study on this phenomenon, see Rosenthal & Jacobson, 1968; for a more recent review of...
A vapor-compression refrigeration system which operates on the cascade cycle arrangement shown below is used to obtain refrigeration at a low temperature. Refrigerant-12 is the working fluid in the high-temperature cycle and Refrigerant-13 is used in the low-temperature cycle. For the Refrigerant 13 cycle, the working fluid enters the compressor as saturated vapor at -30°F and is compressed isentropically to 250 lbf/in2. Saturated liquid leaves the intermediate heat exchanger at 250 lbf/in2 and enters the expansion valve. For the Refrigerant...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
2. The structure of the commonly used organic solvent dimethylformamide (DMF) is shown below. The numbers by each carbon atom are shown to distinguish each C atom in the molecule. Using Valence Bond Theory, answer the questions in parts a) and b). (4 pts) o: н LH H) N )H -Co HIH Dimethylformamide a) Specify the hybrid orbitals for each atom in the molecule indicated below C 2): N: C(1): b) Identify the bond type(s) and the overlapping orbitals of...
A battery of cylindrical membranes shown below is used for an extractive bioconversion. Extractive bloconversion means that fermentation and extraction of product occur at the same time. inner tube product) annular space A 10% glucose in water solution is passed through the annular space at a rate of 70 kg/h. An organic solvent enters the inner tube at a rate of 50 kg/h which cannot penetrate the membrane. On the other hand, glucose and water do not enter the inner...
(100 points) Figure below shows the schematic diagram of a two-stage cascade refrigeration system (also called the Economizer 2-Stage Refrigeration Cycle). Comparing to the cascade two-stage refrigeration system discussed in In-class Activity #10a, in this case, the flash chamber (now called Flash Intercooler) is still used but the mixing chamber is removed. The superheated vapor (2) out of the low-pressure compressor (1) is routed into the flash chamber, and the saturated vapor (3) out of the flash chamber enters directly...
what is the prediction of the unknown amino acids mixture
based on the strip from thin layer chromatography sheet?
The unknown mixtures can be ala plus asp, ala plus asp plus
lys, lys plus asp or ala plus lys.
anion exchange resin was used
Tubes 2,3, 6 and 7 had a spot appear that was light pink
We were unable to transcribe this imageWe were unable to transcribe this imageH-) to the column followed by a sufficient amount of the...
5. When all of the sample to be collected has left the
column, will the drop of solution coming off the tip of the column
be acidic, basic or neutral?
6. How many H+ ions would be displaced from the ion
exchange column by 1 Cu2+ ion?
7. Binding sites on the ion exchange resin are saturated
with which ion before the sample solution is added?
8. Ions are displaced from the resin binding sites by
any ion that has...
All work must be shown. That is, you need to show the steps and calculations you used to arrive at every answer for credit - For example, I need to see which two numbers you divided to arrive at a particular S? value, F-ratio value, etc. The "Pygmalion Effect" refers to the effect of teacher expectations on student academic achievement and performance (for the classic study on this phenomenon, see Rosenthal & Jacobson, 1968; for a more recent review of...
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