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- 40. Which of the following affects the sedimentation of a particle in gradient ultracentrifugation? Group of answer choices the affinity of the particle for the gradient solution the viscosity of the particle solution the total mass of the gradient and tube the density of the gradient solution the number of hydrophobic residues0.5M HA electrolyte with a degree of dissociation of 0.2; It is placed in a conductivity cell with a length of 0.9 cm and an area of 2 cm2 and its conductivity is read as 300 mS. According to these data; a) Equivalent conductivity of the electrolyte b) Boundary equivalent conductivity c) Decomposition constantZinc is to be used as an internal standard for the polarographic analysis of thallium. A standard solution containing twice the concentration of zinc as Thallium has a diffusion current of 1.89 µA for Ti and 3.50 µA for Zn. A 10.0g alloy was dissolved in 500 mL, 25 mL of this solution was mixed with 25 mL of 1.0 x 10-3 M Zn 2+ solution. The diffusion currents of this final solution are 18.2µA for Tl+ and 14.5µA for Zn+. Calculate % Ti in the sample analysed
- 0.5M HA sample with 0.2 dissociation; It is placed in a conductivity cell with a length of 0.9 cm and an area of 2 cm2 and its conductivity is read as 300 mS. For this purpose;a) Equivalent conductivity of the electrolyte ?b) Boundary equivalent conductivity ?c) Decomposition constant ?At 0°C and 1 bar, a monolayer of CO adsorbed on 1 g of Fe/Al2O3 catalyst occupies a volume of 4.25 cm3. What is the area of the catalyst? The area per adsorbed particle is 0.165 nm2. Give your answer in m2.An amino acid moves randomly through water with steps of about 3 angstroms (3 x 10^-8 cm) in length at a rate of 1 x 10^10 steps per second. This substance is passing through a reverse phase HPLC column which has a plate height of 0.010 cm. 1. Estimate the diffusion coefficient for the amino acid in water. 2. Calculate the width at the base of the elution zone after the amino acid has migrated 50 cm through the column
- If light machinery oil has a viscosity of 5E-2 Pa-s and density of 970 kg/m³ at 25°C, how long will it take for a sample to pass through a viscometer if water under this condition takes 1 min? Density of water is 1000 kg/m³ and its viscosity is 8.9E-4 Pa-s.A. 36.5 minB. 47.7 minC. 57.9 minD. 64.4 minWhat is the n-factor (valency factor) of Silver Nitrate (AgNO3)? please also help me with this, thank you so much!An analyst wants to find out the active surface of his electrode before conducting his analyzes. To do this, he carried out a series of measurements by cyclic voltammetry (CV) using a 1 mM solution of K4Fe(CN)6 dissolved in 0.1M NaCl. He recorded the anodic peak intensity (ip) corresponding to the oxidation of Fe(II) to Fe(III) as a function of the scanning speed (v) of the CV (see table). What is the active surface of the electrode? Data: Fe diffusion coefficient (CN)64-, D = 6.67x10-6 cm2/s Randles-Sevcik equation ip = (2,69x105)n3/2ACD1/2v1/2 rate (v/s) ip (A) 5,00E-02 5,75E-05 1,00E-01 7,68E-05 2,00E-01 9,94E-05 5,00E-01 1,42E-04 1,00E+00 2,07E-04
- For the adsorption of a substance A from aqueous solution by charcoal at 25C, the Freundlich constants are n = 3.0 and k = 0.50 for y in grams per gram and C in g L-1. What weight of A will be adsorbed by 2 g of charcoal from 1 L of a solution containing originally 2 g of substance? Answer is [1 g]What arc the advantages of microfabricated ISEs? Describe typical applications of this type of sensor.5. An infinite flat plate of a solid has a surface potential of 50 mV in an infinite bath of 10-2 molL-1 NaCl(aq) aqueous solution at 298K. Make a plot of the potential, y, the Na+ ion concentration, and the Cl- ion concentration as a function of distance from the interface using (a) the exact equation for potential and (b) the low potential approximation. Comment on the difference between your answer for (a) and (b).