For each of the following questions, more than 1 answer may be correct: 1. Molecular adsorption a. Describes the adsorption of gases on the surface of a solid b. Is used in the separation of substances c. Describes the preferential adsorption of substances with positively or negatively charged function groups d. Has utility in the production of purified water in pharmacy 2. Mechanism of action of polar solvents (water) includes a. Dissolving with similar internal pressures through induced dipole interactions b. Breaking covalent bonds and ionized weak electrolyte c. Formation hydrogen bridges with non-electrolytes d. Reduction the attraction between the ions of strong and weak electrolytes.

For each of the following questions, more than 1 answer may be correct: 1. Molecular adsorption a. Describes the adsorption of gases on the surface of a solid b. Is used in the separation of substances c. Describes the preferential adsorption of substances with positively or negatively charged function groups d. Has utility in the production of purified water in pharmacy 2. Mechanism of action of polar solvents (water) includes a. Dissolving with similar internal pressures through induced dipole interactions b. Breaking covalent bonds and ionized weak electrolyte c. Formation hydrogen bridges with non-electrolytes d. Reduction the attraction between the ions of strong and weak electrolytes.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter29: Supercritical Fluid Chromatography And Extraction

Section: Chapter Questions

Problem 29.11QAP

See similar textbooks

Similar questions

A monolayer of CO molecules is adsorbed on the surface of 1.00 g of an Fe/AI2O3 catalyst at 77 K, the boiling point of liquid nitrogen. Upon warming, the carbon monoxide occupies 4.25 cm3 at O oC and 1.00 bar. What is the surface area of the catalyst?
What part does adsorption play in froth floatation for the concentration of sulphide ores and heterogeneous catalysis?
What complications would a dried-out column (solvent level is below the top of the silica) introduce to the elution and isolation of pigments?
Consider the following series of poly(phenylene oxide) polymers A–D, and their glass transition temperatures. Explain how the differences in structure can account for the differences in Tg
Confirm that the following CO adsorption data on activated carbon at 273 Kfollow the Langmuir or Freundlich isotherm and determine the volumecorresponding to the complete coverage of the surface.
Do not give handwriting solution Using 0.901 g/cm3 for density of tri - isopropylsilanol (i-C3H7)3SiOH and assuming spherical shape of the molecule, determine its molecular cross section and the maximal grafting density for these molecules supported on a flat silica surface.
The volume of O2(g) adsorbed on a surface of 1 g of a silica sample at 5°C is V1=1.4 cm3 at P1=95.1 torr and V2=10.6 cm3 at P2=760 torr. Identify the maximum volume of oxygen, Vm, that can be adsorbed. Consider the Langmuir isotherm model
Types of Co-Perciptation 1- Surface Adorption 2 - Mixed Crystal Formation 3- Occlusion 4- Mechanical Entrapment explain each type properly
When plotted according to the linear form of the BET equation, data for the adsorption of N2 on Graphon at 77 K give an intercept of 0.005 and a slope of 1.5 (both in cm3 STP per gram). Calculate Asp assuming a molecular area of 16 (angstrom)2 for N2. Calculate also the heat of adsorption for the first layer (the heat of condensation for N2 is 1.3 kcal/mol). Would your answer for Vm be much different if the intercept were taken to be zero (and the slope the same)? Comment briefly on the practical significance of your calculation.
Determine the solubility parameters for amorphous polypropylene and poly(methyl methacrylate). (Densities of the two polymers are 0.905 and 1.18 g/mL, respectively.) Consult a polymer handbook and suggest suitable solvents for the two polymers on the basis of solubility parameters.
This is the most common industrial process for preparing large-scale production of nanoparticles wherein a liquid or gas is fed into a furnace and the nanoparticles are recovered by air classification. a. sol-gel method b. sputtering c. pyrolysis d. laser ablation
1. The properties that must be possessed by the adsorption reagent in air sampling are…a. Reagents must be resistant to oxidationb. Reagents must be qualitativec. Reagents must be applicable to all gaseous analytesd. Reagents must be in large quantities