Dds

1. C P E E X Y O P N M Z Y J
O C U V O O B L W I C T F
M O N R N W M T A X V C Q
P B E L E M E N T T L V Z
O B G H H R H E B U I B T
U A Z T E R P K Y R U P I
N S U B S T A N C E T B E
D U K G B M J L Z X V B Y
I H O M O G E N E O U S M
H E T E R O G E N E O U S

2. C P E E X Y O P N M Z Y J
O C U V O O B L W I C T F
M O N R N W M T A X V C Q
P B E L E M E N T T L V Z
O B G H H R H E B U I B T
U A Z T E R P K Y R U P I
N S U B S T A N C E T B E
D U K G B M J L Z X V B Y
I H O M O G E N E O U S M
H E T E R O G E N E O U S

3. PURE SUBSTANCE
AND MIXTURE
GENERAL CHEMISTRY 1

4. LEARNING OBJECTIVES
1. Identify the sample as pure
substance or mixture;
2. Distinguish the homogeneous and
heterogeneous; and
3. Classify the pure substance as
element or compound.

5. PURE SUBSTANCE
A pure substance is a single kind of matter
that cannot be separated into other kinds of
matter by any physical means. A pure
substance always has a definite and constant
composition.
Example: gold, copper, oxygen, chlorine, diamond,
etc.

6. ELEMENT
 An element is a substance that consists of only one
type or kind of atom. An element is a pure substance as
it cannot be broken down or transformed into a new
substance even by using some physical or chemical
means. Elements are mostly metals, non-metals or
metalloids.

7. COMPOUND
 Compounds, on the other hand, are also pure
substances when two or more elements are combined
chemically in a fixed ratio.

8. MIXTURE
 A mixture is a physical combination of two or more
pure substances in which each substance retains its
own chemical identity.
Example:
 Gas and gas like nitrogen and oxygen in the atmosphere.
 A solution like water and oil.
 Gas and liquid such as water.
 Solid and liquid such as sand and water

9. HOMOGENEOUS
 A homogeneous mixture occasionally called a solution,
is comparatively unvarying in configuration or
constant.

10. HETEROGENEOUS
 A heterogeneous mixture is a concoction whose
configuration varies from spot to spot within the
sample.

11. Pure Substances Mixtures
It cannot be broken down or
separated into new products.
It can be separated using different
separation methods.
Constant physical and chemical
properties.
Mixtures have varying physical and
chemical properties.
Pure substances are made up of a
single element.
A mixture is a combination of two
substances or elements.