Colloidal Chemistry Quiz

A heterogeneous mixture involving very fine particles known as the dispersed phase suspended throughout a continuous phase, called the dispersion medium.

The substance that gets dispersed into smaller particles within a mixture.

The surrounding substance in which the dispersed phase is suspended.

A type of colloidal dispersion where gas particles are spread throughout a liquid, creating a foamy substance.

A type of colloidal dispersion where liquid droplets are dispersed throughout another liquid.

A type of colloidal dispersion where solid particles are dispersed throughout a liquid.

A type of colloidal dispersion where a liquid is dispersed throughout a solid, forming a jelly-like substance.

A type of colloidal dispersion where solid particles are dispersed throughout a solid, leading to a solid solution.

Colloidal dispersions where the dispersed particles have a strong affinity for the dispersion medium, meaning they readily interact and become surrounded by the medium.

Colloidal dispersions where the dispersed particles have a weak affinity for the dispersion medium, meaning they tend to avoid interaction with the medium.

The viscosity of the dispersion medium does not increase significantly with the addition of lyophobic colloidal particles. These particles tend to be symmetrical and un-solvated, meaning they don't readily interact with the surrounding liquid.

The viscosity of the dispersion medium increases significantly as the concentration of amphiphile increases in lyophilic colloids. This is because the dispersed particles become asymmetric, forming structures called micelles that increase the viscosity.

Lyophilic colloids often form gels at sufficiently high concentrations due to the strong interactions between the dispersed particles and the dispersion medium. The formation of gels is related to the solvation effects and the asymmetrical shape of the molecules, which tend to link together.

Small molecules in a lyophobic colloid that form clusters called micelles. These are like tiny bubbles that trap a hydrophobic part inside, surrounded by a hydrophilic outer layer.

Chemicals that help stabilize lyophobic colloids. They create a barrier between the particles, preventing them from clumping together.

A type of stabilizing agent; molecules with two parts: a hydrophilic head that loves water and a hydrophobic tail that hates water. They create a bridge between the liquid and the particles.

This refers to the tendency of substances to become wetted, absorbed, and surrounded by a liquid. It's a measure of how well a substance interacts with a solvent.

The particles in a lyophilic colloid are surrounded and embraced by the liquid molecules. Think of a sponge soaking up water.

This describes the process where particles in a lyophobic colloid form clusters and clump together. This leads to instability in the colloid.

In a lyophobic colloid, electrical repulsion between the charged particles on the surface of the dispersed phase helps maintain their dispersion and stability.

Lyophilic colloids are typically stabilized by solvation, where the dispersed phase interacts with the dispersion medium through attractive forces, forming a 'solvation shell' around each particle.

The increase in entropy (disorder) of a polymer chain when it unfolds in a solvent contributes to the thermodynamic stability of lyophilic sols. This unfolding increases the randomness of the system, favoring dispersion.

The process where particles in a colloidal dispersion clump together and settle out. This happens when the repulsive forces between particles are overcome, causing them to stick and form larger aggregates.

A substance that helps stabilize a colloidal dispersion by forming a protective coating around the dispersed particles, preventing them from clumping together.

The phenomenon where a lyophilic colloid, when added to a lyophobic colloid, can help stabilize the lyophobic colloid by creating a protective layer around its particles.

The process of adding electrolytes to a colloidal dispersion to cause the particles to clump together and settle out. This is because electrolytes reduce the stability of the dispersion, allowing the particles to overcome their repulsive forces.

The process where particles in a lyophobic sol clump together to form larger aggregates, leading to a separation of the dispersed phase from the dispersion medium.

A type of gel formed by the flocculation of flat, plate-like particles, like clays. The arrangement creates a structure resembling a 'card house'.

A reversible change in viscosity, where a gel becomes less viscous when shaken and returns to its original state when left undisturbed.

Materials like aluminum hydroxide and magnesium hydroxide that form gels through flocculation, with relatively weak forces holding the particles together.

The property of a particle to attract and hold molecules of the dispersion medium around it. Hydrophilic particles have a strong affinity for water molecules.

The shape of colloidal particles in dispersion is important because it influences their surface area, which affects the interactions between the particles and the dispersion medium.

High molecular weight polymers and naturally occurring macromolecules often form random coils in aqueous solution, increasing their surface area and interactions with the medium.