Tyndall Effect and Brownian Movement
Chemistry ⇒ Solutions and Colloids
Tyndall Effect and Brownian Movement starts at 10 and continues till grade 12.
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Describe an experiment to demonstrate the Tyndall effect using a colloidal solution.
Describe how the Tyndall effect helps in the diagnosis of certain medical conditions.
Describe the role of Brownian movement in preventing the coagulation of colloidal particles.
Describe the significance of Brownian movement in colloidal stability.
Explain how temperature affects Brownian movement in colloidal systems.
Explain why Brownian movement decreases as the viscosity of the dispersion medium increases.
Explain why the Tyndall effect is not observed if the refractive indices of the dispersed phase and dispersion medium are the same.
A colloidal solution of sulfur in water is prepared. When a beam of light is passed through it, the path of the beam becomes visible. What phenomenon is being observed?
Brownian movement is caused by: (1) Gravity, (2) Collision with molecules of the dispersion medium, (3) Magnetic field, (4) Electric field
Brownian movement is more pronounced in: (1) Smaller particles, (2) Larger particles, (3) Both equally, (4) None of these
Brownian movement is observed in which of the following systems?
(1) True solution
(2) Colloidal solution
(3) Suspension
(4) Both (2) and (3)
Which of the following best explains the cause of Brownian movement?
(1) Gravitational force
(2) Random collisions with solvent molecules
(3) Magnetic attraction
(4) Electrostatic repulsion
Brownian movement provides evidence for the ________ nature of matter.
Fill in the blank: The random motion of colloidal particles due to collisions with molecules of the dispersion medium is called ___________.
Fill in the blank: The Tyndall effect is named after the scientist _________.
Fill in the blank: The Tyndall effect is observed when the refractive indices of the dispersed phase and dispersion medium are _________.
State whether the following statement is true or false: Brownian movement increases with a decrease in temperature.
State whether the following statement is true or false: The Tyndall effect is used in ultramicroscopy to detect colloidal particles.
True or False: Brownian movement can be observed with the naked eye in all colloidal systems.
True or False: The Tyndall effect can be observed in both colloidal and suspension systems.
