Centrifugation and Angular Velocity Quiz

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What is the name of the ions that are attracted to the surface of the micelle, reducing the overall negative charge?

Anions
Cations
Counterions
Gegenions (correct)

Which of the following is NOT a property of micelles shown in the figure?

Spherical shape in water
Reversed structure in non-aqueous media
Hexagonal packing in water (correct)
Laminar structure at higher amphiphile concentrations

What is the purpose of the Faraday-Tyndall effect described in the text?

To measure the viscosity of colloidal particles
To visualize the scattering of light by colloidal particles (correct)
To determine the surface charge of colloidal particles
To observe the size and shape of colloidal particles

How does the electron microscope differ from the ultramicroscope in observing colloidal particles?

The electron microscope can resolve the size and shape of colloidal particles, including those approaching molecular dimensions, while the ultramicroscope cannot. (C) Signup and view all the answers

Which property of colloidal particles is NOT mentioned in the text?

Thermal motion (D) Signup and view all the answers

Which of the following techniques is NOT mentioned in the text for the study of colloidal particles?

Electrophoresis (D) Signup and view all the answers

What is the purpose of using the ultracentrifuge?

To produce a force a million times that of gravity (B) Signup and view all the answers

How is viscosity defined in the context of this text?

Viscosity is the resistance to flow of a system under an applied stress (B) Signup and view all the answers

Which equation did Einstein develop for dilute colloidal dispersions?

η= η0 (1+2.5 Ф) (A) Signup and view all the answers

How is the speed of a centrifuge commonly expressed?

In terms of revolutions per minute (rpm) (D) Signup and view all the answers

What does the volume fraction represent in the context of viscosity coefficients?

(the volume of the particles divided by the total volume of the dispersion) (B) Signup and view all the answers

What replaces the acceleration of gravity in a centrifuge?

$w2x$ (C) Signup and view all the answers

What factor defines the resolving power of an electron microscope?

The wavelength of the radiation used (C) Signup and view all the answers

What is the typical distance (d) by which two objects can be resolved in an electron microscope?

5 A° (B) Signup and view all the answers

Which property is used to determine the molecular weight of colloids?

Turbidity (C) Signup and view all the answers

What is the equation used to obtain the molecular weight of a colloid based on turbidity?

Hc/T = 1/M + 2Bc (A) Signup and view all the answers

Which method is commonly used for determining the shape and size of colloid particles?

Light Scattering (A) Signup and view all the answers

What characteristic feature distinguishes the resolving power of an electron microscope from an optical microscope?

Smaller wavelength of radiation (C) Signup and view all the answers