Colloids

Define colloidal dispersion.

• A true solution with particles suspended in the solvent.

• Small particles suspended in solvent; not a true solution.

• A heterogenous mixture of an immiscible solute and solvent.

In what type of phase might you find colloidal dispersion?

• Solid

• Liquid

• Gas

• Mixture

What is the Tyndall effect?

• The inability of oil to mix with water.

• How the tides effect a solution's ability to mix.

• The scattering of light due to colloids.

Tags

NGSS.HS-PS4-5

Which of the following would be a hydrophilic aqueous colloidal dispersion?

• Oil

• Protein

• Salt Water

• Dichloromethane

Tags

NGSS.HS-ESS2-5

Which of the following would be a hydrophobic aqueous colloidal dispersion?

• Oil

• Protein

• Salt Water

• Dichloromethane

What is coagulation in relation to colloids?

• The thickening (clumping) of particles in a solution due to the addition of electrolytes.

• The reason that we need soap to wash oil off of our hands.

• The process by which we can remove colloid particles from solutions.

Tags

NGSS.HS-PS1-3

Which of the following factors DO NOT affect reaction rates?

• Nature of reacting species

• State of reactants

• Density

• Temperature

• Concentration

Tags

NGSS.HS-PS1-5

What does a catalyst do?

• Increases the rate of reaction without undergoing a permanent change.

• Decreases the rate of reaction and undergoes a permanent physical change.

• It does nothing. They are pointless.

Tags

NGSS.HS-PS1-5

Why do we need soap to wash oil off of things?

• We need soap because soap has both hydrophilic and hydrophobic parts.

• We need soap because water is not strong enough to wash off oil.

• We need soap because oil is hydrophobic (water-fearing).

• We need soap because soap particles are larger than water.

Tags

NGSS.MS-PS1-2

Why do colloid particles seem to float in solution?

• They are too small to settle out by gravity.

• They are anti-gravitational particles.

• They disperse so that they are equidistant from each other.