Chapter 15, Problem 78A

a.

Interpretation Introduction

Interpretation: To give the name for the following description.

Concept Introduction: When two substances of the same type are mixed, they form a true solution. The particle’s size in a suspension is much larger than the solution that the particles settle down in the bottom. A colloidal solution is a heterogenous solution.

Answer to Problem 78A

The descriptions that describe true solutions are 1,3,6 and 8.

Explanation of Solution

The given descriptions that represent a true solution are discussed as follows:

(1) The particles do not settle on standing.

(3) The size of the particle is less than 1 nanometer.

(6) One cannot see the particles with an unaided eye.

(8) An example of a true solution is salt water.

b.

Interpretation Introduction

Interpretation: To give the name for the following description.

Concept Introduction: When two substances of the same type are mixed, they form a true solution. The particle’s size in a suspension is much larger than the solution that the particles settle down in the bottom. A colloidal solution is a heterogenous solution.

Answer to Problem 78A

The descriptions that describe colloids are 1,2,5,6,7 and 9.

Explanation of Solution

The given descriptions that represent a true solution are discussed as follows:

(1) The particles do not settle on standing.

(2) A colloidal solution is a heterogenous solution.

(5) It demonstrates the Tyndall effect.

(6) One cannot see the particles with an unaided eye.

(7) Homogenized milk is an example of a colloidal solution.

(9) Jelly is another example of a colloid.

c.

Interpretation Introduction

Interpretation: To give the name for the following description.

Concept Introduction: When two substances of the same type are mixed together, they form a true solution. The particle’s size in a suspension is much larger than the solution that the particles settle down in the bottom. A colloidal solution is a heterogenous solution.

Answer to Problem 78A

The descriptions that describe suspension are 2,4 and 5.

Explanation of Solution

The given descriptions that represent a suspension are discussed as follows:

(2) A colloidal solution is a heterogenous solution.

(4) The particle of a suspension can be filtered out.

(5) It demonstrates the Tyndall effect.