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10 Questions

8 Views

Rate Theory Bond Broadening Quiz

Created by

@FruitfulSavannah

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Questions and Answers

What are the three main factors contributing to zone broadening?

Mobile phase composition, stationary phase composition, solute size

Longitudinal diffusion, resistance to mass transfer, multiple path effect (correct)

Temperature change, pressure variation, solute concentration

Column length, column diameter, flow rate

What does the degree of band broadening in longitudinal diffusion depend on?

Column temperature and pressure

Column length and column diameter

Diffusion of the solute and the flow rate of the solute through the column (correct)

Mobile phase composition and stationary phase composition

What does HL represent in the equation HL = L1 DM / V?

Diffusion of the solute in the mobile phase

Band broadening as a result of longitudinal diffusion (correct)

Velocity of solute in the mobile phase

Flow rate of the solute through the column

When is longitudinal diffusion not very important in liquid chromatography?

At low flow rates Signup and view all the answers

What does resistance to mass transfer or mass transfer diffusion refer to?

Mass transfer of solute in mobile or stationary phases Signup and view all the answers

What does the band broadening as a result of longitudinal diffusion depend on?

Diffusion of the solute and the flow rate of the solute through the column Signup and view all the answers

When is longitudinal diffusion considered not very important in liquid chromatography?

At low flow rates Signup and view all the answers

What does resistance to mass transfer or mass transfer diffusion refer to?

The hindrance encountered by solute molecules in moving from the stationary phase to the mobile phase Signup and view all the answers

What is the equation representing band broadening as a result of longitudinal diffusion?

$HL = L1 \frac{DM}{V}$ Signup and view all the answers

3

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Study Notes

Factors Contributing to Zone Broadening

Three main factors contribute to zone broadening: longitudinal diffusion, eddy diffusion, and resistance to mass transfer

Longitudinal Diffusion

Degree of band broadening in longitudinal diffusion depends on the ratio of column length to particle diameter
Longitudinal diffusion is not very important in liquid chromatography when the flow rate is high or the column is packed with small particles
Band broadening as a result of longitudinal diffusion depends on the column length, particle diameter, and diffusion coefficient

Equation and Terminology

HL = L1 DM / V represents the equation for band broadening as a result of longitudinal diffusion
HL represents the height equivalent to a theoretical plate
Resistance to mass transfer or mass transfer diffusion refers to the hindrance to the solute molecules' movement in the column

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Description

Test your knowledge on rate theory and bond broadening with this quiz. Learn about the factors affecting zone broadening and the behavior of molecules in the context of solutes and diffusion.