1. Colloids

2. -To know the definition of colloids
-To determine the classification of
colloids
-To distinguish the common and some
examples of colloids according to their
classification
-To know how colloids are classified.
Objectives:

3. Colloids
The word "Colloid" was derived
from the Greek, "kolla" for glue, as
some of the original organic colloidal
solutions were glues.

4. The mixture is also called a colloidal solution,
colloidal system, or colloidal dispersion. Colloidal
systems can be any combination of these states.
Colloid formation can be classified in two
systems, namely reversible and irreversible. In an
irreversible system, the products are so stable or
removed so well that the original reactants cannot
be reproduced.

5. Find words associated with colloids.
Motivation

7. Sols Foams Emulsions Gel
Connect each mixture with their specific classification.
Activity 1

10. A foam is a substance that is formed by
trapping pockets of gas in a liquid or solid. In most
foams, the volume of gas is large, with thin films
of liquid or solid separating the regions of gas.
foam

11. An emulsion is a mixture of two or more liquids that
are normally immiscible (nonmixable or unblendable).
Emulsions are part of a more general class of two-phase
systems of matter called colloids.
emulsion

12. __________________________________
__________________________________
__________________________________
Tell whether the picture is an emulsion or not.
Activity 2

13. A sol is a colloidal suspension of very
small solid particles in a continuous liquid medium. They
are quite stable and show the Tyndall effect. Examples
include blood, pigmented ink, and paint.
Artificial sols may be prepared by dispersion or
condensation. Dispersion techniques include grinding
solids to colloidal dimensions byball milling and Bredig's
arc method. The stability of sols may be maintained by
using dispersing agents. Sols are commonly used in
preparing sol-gels.

15. A gel (from the lat. gelu—
freezing, cold, ice or gelatus—
frozen, immobile) is a solid, jelly-
like material that can have
properties ranging from soft and
weak to hard and tough.
It is the crosslinking within
the fluid that give a gel its
structure (hardness) and
contribute to the adhesive stick
(tack). In this way gels are a
dispersion of molecules of a liquid
within a solid in which the solid is
the continuous phase and the
liquid is the discontinuous phase.
gel

16. 1. GSLE is a solid, jelly-like material that can have
properties ranging from soft and weak to
hard and tough.
In this way gels are a dispersion of molecules of a
liquid within a solid in which the solid is the
____2______ and the liquid is the_____3____.
2. coouinntus pahes
3. dsincouintuos pshae
It is _____4________ the within the fluid
that give a gel its structure (hardness) and
contribute to the _____5____ (tack).
4.conkinsslirg
5. ahvdeesi sktic
Activity 3

17. 1-2. The term colloid comes from the Greek words “kolla” and “oidos” .
What are the meaning of KOLLA and OIDOS
a. milk, acid
b. glue, appearance
c. glue, phase
3-4.Colloidal system is composed of two phase. What are these phase?
a. continuous phase and dispersed phase
b. continuous phase and dispersion medium
c. discontinuous phase and dispersed phase
5-6. Colloidal system can be classified according to their _____________and
_______________.
a. Internal phase and dispersed phase
b. dispersion medium and continuous phase
c.dispersion medium and dispersed phase
QUIZ

18. 7. what is the suspension of liquid or solid particles in gas?
A. gel
b. foams
c. aerosols
8. these are the colloidal dispersion of gas bubbles in liquid or solids.
a. gel
b. foams
c. aerosols
9. What is the colloidal dispersion of liquid in either a liquid or solid?
A. emulsion
b. sols
c. aerosols
10. it is a solid dispersed in either a solid or a liquid.
A. emulsion
b. sols
c. aerosols

19. 11. What are the colloidal system in which the dispersed phase consist of fibrous,
interwoven particles?
A. emulsion
b. sols
c. gels
12. what is the interwoven particles which exert marked effect on the physical
properties of the dispersing medium?
A. fiber
b. fibrils
c. fibroins
13. who is the father of colloid chemistry?
A. Robert Brown
b. Thomas Graham
c. john Tyndall
14. Which of the following is NOT a colloidal system?
A. marshmallow
b. seawater
c. mayonnaise
15. which of the following is an aerosol?
A. milk
B. fog
C. cream

20. 1. Gel
2. continuous phase
3. discontinuous phase
4. Crosslinking
5. adhesive stick
1-2.b
3-4.b
5-6.a
7.c
8.b
9.a
10.b
11.c
12.b
13.b
14.b
15.b
Answer key: