Question

Brownian movement explains the \textit{property of colloidal solutions:}

• A. Optical
• B. Electrical
• C. Kinetic
• D. Mechanical

Hint:

Brownian motion is a result of the kinetic energy of particles in a colloidal solution.

Answer 1

The Correct Option is C

The Brownian movement refers to the random motion of particles suspended in a fluid (liquid or gas) resulting from their collision with fast-moving molecules in the fluid. This phenomenon is vital for understanding various properties of colloidal solutions. Here's why:

The characteristic property of colloidal solutions explained by Brownian movement is their kinetic nature. In colloidal solutions, dispersed particles are subject to continuous jostling due to thermal energy, leading to perpetual and erratic movement.

Steps explaining why this property is kinetic:

1. Random Motion: The kinetic energy of the colloidal particles results in random movement. These motions are evidence of the constant kinetic energy inherent in the particles.
2. Collision Impact: Each particle's kinetic energy causes it to collide with the surrounding medium molecules constantly, maintaining the suspension of particles.
3. Energy Transmission: The energy from temperature (thermal) fluctuations is transferred to the colloidal particles, causing continuous motion.

This random motion ensures that colloidal particles do not settle and remain suspended in the solution. Hence, Brownian movement is closely associated with the kinetic properties of colloidal solutions.

Answer 2

The question asks which property of colloidal solutions Brownian movement explains. Check each option against what Brownian movement actually is.

1. Optical: the optical property of colloids is the Tyndall effect, light scattering caused by particle size, which is a different phenomenon from the random jostling of particles described by Brownian movement.
2. Electrical: the electrical property of colloids relates to the surface charge that particles carry, seen in effects like electrophoresis, which is unrelated to the random zig-zag motion Brownian movement describes.
3. Kinetic: Brownian movement is the continuous, random, zig-zag motion of colloidal particles caused by collisions with fast-moving solvent molecules. This motion is a direct result of the particles' kinetic energy, matching this option exactly.
4. Mechanical: mechanical properties would relate to physical strength or rigidity of a material, not the random thermal motion of dispersed particles.

Brownian movement is random particle motion driven by collisions and kinetic energy, which is a kinetic property.

So the correct answer is kinetic.