Colloid Dispersion and Sedimentation Quiz

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What is the formula for the velocity of sedimentation of spherical particles according to Stoke's law?

V = 2r^2g(ρ - ρo) / 9ηo (correct)

V = 2rg(ρ - ρo) / 9ηo

V = r^2g(ρ - ρo) / 9ηo

V = r^2g(ρ - ρo) / 6ηo

What tends to offset the sedimentation of colloidal particles?

Electrostatic repulsion

Molecular weight

Brownian movement (correct)

Centrifugal force

What force must be applied to cause sedimentation of colloidal particles?

Ultracentrifugation (correct)

Gravity

Hydrodynamic force

Electrostatic force

In an ultracentrifuge, how do the particles settle?

According to their molecular weight Signup and view all the answers

What is osmosis?

The migration of solvent molecules through a semipermeable membrane Signup and view all the answers

Ultracentrifugation is a weaker force compared to gravity in causing sedimentation of colloidal particles.

False Signup and view all the answers

In normal dispersions, the dispersed particles do not tend to settle under the influence of gravity.

False Signup and view all the answers

The Brownian movement tends to offset the sedimentation of colloidal particles.

True Signup and view all the answers

Osmosis is the migration of particles from a region of higher concentration to a region of lower concentration.

True Signup and view all the answers

In an ultracentrifuge, the particles settle according to their size.

False Signup and view all the answers

Colloid Dispersion and Sedimentation Quiz

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Questions and Answers

What is the formula for the velocity of sedimentation of spherical particles according to Stoke's law?

What tends to offset the sedimentation of colloidal particles?

What force must be applied to cause sedimentation of colloidal particles?

In an ultracentrifuge, how do the particles settle?

What is osmosis?

Ultracentrifugation is a weaker force compared to gravity in causing sedimentation of colloidal particles.

In normal dispersions, the dispersed particles do not tend to settle under the influence of gravity.

The Brownian movement tends to offset the sedimentation of colloidal particles.

Osmosis is the migration of particles from a region of higher concentration to a region of lower concentration.

In an ultracentrifuge, the particles settle according to their size.

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