Module 6

Question 1

Three possible mixtures that may be obtained when non reacting substances are mixed

Answer 1

Coarse mixture, colloidal mixture, true solution

Question 2

– the individual particles are distinguishable and mechanically separable

Answer 2

Coarse mixture

Question 3

– apparently homogeneous, can also be mechanically
separable

Answer 3

Colloidal mixture

Question 4

• this result to a homogeneous phase, cannot be separated by mechanical means

Answer 4

True solution

Question 5

A solution consists of

Answer 5

solute and a solvent

Question 6

―substance which is usually present in large excess or it is a substance in which solution takes place.

Answer 6

Solvent

Question 7

― substance that dissolves

Answer 7

Solute

Question 8

The solute is always a ___, and the solvent is a ____.

Answer 8

solid, liquid

Question 9

With respect to solubility, the solutions are classified as

Answer 9

Saturated, unsaturated, supersaturated

Question 10

– which contains as much solute as it can hold

Answer 10

Saturated

Question 11

– which contains less than this amount of solute

Answer 11

Unsaturated

Question 12

– which contains more than this amount

Answer 12

Supersaturated

Question 13

How to determine the state of a solution with respect to saturation?

Answer 13

Introduce some of the dissolving substance; if solute dissolves, solution is unsaturated; if no further solubility takes place, solution is saturated; if precipitation takes place, solution is supersaturated.

Question 14

Solutions can be subdivided to:

Answer 14

Solutions of Non – Electrolytes
Solutions of Electrolytes

Question 15

These solutions have the tendency to dissociate into ions

Answer 15

Solutions of Electrolytes

Question 16

In these solutions, the solute persists in its molecular form when dissolved by a solvent. They do not exhibit a tendency to dissociate into ions

Answer 16

Solutions of Non – Electrolytes

Question 17

Factors that affect solubility:

Answer 17

1. The nature of solute and solvent
2. The temperature
3. The pressure

Question 18

If reaction is exothermic, solubility ______ as temperature increases.

Answer 18

decreases

Question 19

If reaction is endothermic, solubility ______ as temperature increases

Answer 19

increases

Question 20

Solutions can also be classified according to miscibility

Answer 20

Completely miscible
Completely immiscible
Partially miscible

Question 21

Completely miscible - Example:

Answer 21

ethyl alcohol and water

Question 22

Completely immiscible - Example:

Answer 22

oil and water

Question 23

Partially miscible - Example:

Answer 23

water and ether

Question 24

The colligative property that we refer here, depends only on

Answer 24

the number of particles in the solution and not in any way on the nature of these particles.