Chapter 14.1, Problem 2SSC

Interpretation Introduction

Interpretation:

Properties of suspensions and colloids have to be distinguished.

Concept introduction:

A colloid is a heterogeneous mixture in which the dispersed particles are intermediate in size between those of a solution and a suspension. The particles are spread evenly throughout the dispersion medium, which can be a solid, liquid, or gas. The dispersed particles of a colloid are intermediate in size between those of a solution and a suspension. Due to intermediate size of the dispersed particles, they do not settle out from the dispersion medium upon standing.

A suspension is a heterogeneous mixture in which some of the particles settle out of the mixture upon standing. The particle size in a suspension are much larger than those of a solution, so they easily settle out from the dispersion medium due to the gravity.

Answer to Problem 2SSC

Both suspensions and colloids are heterogeneous mixtures. A suspension is identifiable because its particles are large compare to the colloid.

Explanation:

Both suspensions and colloids are heterogeneous mixtures. Here is the some difference in colloids and suspensions.

Colloids	Suspensions
Particle size: 1 – 100 nm, dispersed; large molecules or aggregates	Particle size: over 100 nm, suspended: large particles or aggregates
Pass easily through ordinary filter paper but not through the animal membrane	Do not even pass through ordinary filter paper
Do not settle down on standing	Particles settle out on standing
Cannot be separated by filtration	Can be separated by filtration
Show Brownian motion	Do not show Brownian motion
Diffuse slowly	Do not diffuse
Milk is an example of colloid	Flour in water is an example of suspension

Both suspension and colloid are heterogenous mixtures. The suspensions are identifiable because its particles are large as compared to the colloid.

Explanation of Solution

Both suspensions and colloids are heterogeneous mixtures. Here is the some difference in colloids and suspensions.

Colloids	Suspensions
Particle size: 1 – 100 nm, dispersed; large molecules or aggregates	Particle size: over 100 nm, suspended: large particles or aggregates
Pass easily through ordinary filter paper but not through the animal membrane	Do not even pass through ordinary filter paper
Do not settle down on standing	Particles settle out on standing
Cannot be separated by filtration	Can be separated by filtration
Show Brownian motion	Do not show Brownian motion
Diffuse slowly	Do not diffuse
Milk is an example of colloid	Flour in water is an example of suspension

Conclusion

Both suspension and colloid are heterogenous mixtures. The suspensions are identifiable because its particles are large as compared to the colloid.