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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 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?
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?
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?
In an ultracentrifuge, how do the particles settle?
What is osmosis?
What is osmosis?
Ultracentrifugation is a weaker force compared to gravity in causing sedimentation of colloidal particles.
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.
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.
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.
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.
In an ultracentrifuge, the particles settle according to their size.
