Less diversity of compounds of silicon than carbon should be identified.

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Chapter 21, Problem 5E

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Less diversity of compounds of silicon than carbon should be identified.

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d. In Figure 4, each stationary phase shows some negative correlation between plate count and retention factor. In other words, as k' increases, N decreases. Explain this relationship between k' and N. Plate Count (N) 4000 3500 2500 2000 1500 1000 Figure 4. Column efficiency (N) vs retention factor (k') for 22 nonionizable solutes on FMS (red), PGC (black), and COZ (green). 3000 Eluent compositions (acetonitrile/water, A/W) were adjusted to obtain k' less than 15, which was achieved for most solutes as follows: FMS (30/70 A/W), PGC (60/40), COZ (80/20). Slightly different compositions were used for the most highly retained solutes. All columns were 50 mm × 4.6 mm id and packed with 5 um particles, except for COZ, which was packed with 3 um particles. All other chromatographic conditions were constant: column length 5 cm, column j.§. 4.6 mm, flow rate 2 mL/min, column temperature 40 °C, and injection volume 0.5 μL Log(k'x/K'ethylbenzene) FMS 1.5 1.0 0.5 0.0 ཐྭ ཋ ཤྩ བྷྲ ; 500 0 5 10…

f. Predict how the van Deemter curve in Figure 7 would change if the temperature were raised from 40 °C to 55 °C. Figure 7. van Desmter curves in reduced coordinates for four nitroalkane homologues (nitropropane, black; nitrobutane, red; nitropentane, blue; and nitrohexane, green) separated on the FMS phase. Chromatographic conditions: column dimensions 50 mm × 4.6 mm id, eluent 30/70 ACN/water, flow rates 0.2-5.0 mL/min, injection volume 0.5 and column temperature 40 °C. No corrections to the plate heights have been made to account for extracolumn dispersion. Reduced Plate Height (h) ° 20 40 60 Reduced Velocity (v) 8. (2) A water sample is analyzed for traces of benzene using headspace analysis. The sample and standard are spiked with a fixed amount of toluene as an internal standard. The following data are obtained: Ppb benzene Peak area benzene Peak area toluene 10.0 252 376 Sample 533 368 What is the concentration of benzene in the sample?

Liquid chromatography has been used to track the concentration of remdesivir (a broad-spectrum antiviral drug, structure shown at right) in COVID patients undergoing experimental treatments. Intensity The authors provide the following details regarding standard solutions preparation: HN CN HO OH NH2 Remdesivir (RDV) stock solution (5000 µg/mL) was prepared by dissolving RDV drug powder using the mixture of DMSO: MeOH (30:70 v/v). The RDV working standard solutions for calibration and quality controls were prepared using methanol in concentrations of 100, 10, 1, 0.1, 0.01 µg/mL. 1, 2.5, 5, 7.5, 10, 25, 50, 75, 100, 250, 500, 1000, and 5000 ng/mL sample solutions were prepared freshly by spiking calibration standard solutions into the blank human plasma samples for method calibration. a) What type of calibration method is being described? Why do you think the authors chose this method as opposed to another? b) Based on the details provided in part a, describe an appropriate method blank…

Answer 2

Question

Chapter 21, Problem 5E

Interpretation Introduction

To determine:

Less diversity of compounds of silicon than carbon should be identified.

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Answer 3

Question

Chapter 21, Problem 5E

Interpretation Introduction

To determine:

Less diversity of compounds of silicon than carbon should be identified.

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Answer 4

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Chapter 21, Problem 5E

Interpretation Introduction

To determine:

Less diversity of compounds of silicon than carbon should be identified.

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Answer 5

Chapter 21, Problem 5E

Interpretation Introduction

To determine:

Less diversity of compounds of silicon than carbon should be identified.

Answer 6

Chapter 21, Problem 5E

Interpretation Introduction

To determine:

Less diversity of compounds of silicon than carbon should be identified.

Answer 7

Chapter 21, Problem 5E

Interpretation Introduction

To determine:

Less diversity of compounds of silicon than carbon should be identified.

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Ch. 21 - Prob. 1E Ch. 21 - Prob. 2E Ch. 21 - Prob. 3E Ch. 21 - Prob. 4E Ch. 21 - Prob. 5E Ch. 21 - Prob. 6E Ch. 21 - Prob. 7E Ch. 21 - What are the main classifications of hydrocarbons?...Ch. 21 - Prob. 9E Ch. 21 - What are structural isomers? How do the properties...

Less diversity of compounds of silicon than carbon should be identified.

Solution Summary: The author explains that carbon has smaller size than silicon and is more electronegative in nature, so it can react with almost all kinds of atoms.

Concept explainers

To determine:

Less diversity of compounds of silicon than carbon should be identified.

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Chapter 21 Solutions

Less diversity of compounds of silicon than carbon should be identified.

Solution Summary: The author explains that carbon has smaller size than silicon and is more electronegative in nature, so it can react with almost all kinds of atoms.

Concept explainers

To determine: Less diversity of compounds of silicon than carbon should be identified.

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Chapter 21 Solutions

To determine:

Less diversity of compounds of silicon than carbon should be identified.