Chapter 9 | 8th Science - Matter Around Us | 8th Science : Chapter 9 : Matter Around Us
Chapter: 8th Science : Chapter 9 : Matter Around Us
Matter Around Us
UNIT 9
MATTER AROUND US
Learning Objectives
After the completion
of this lesson, students will be able to:
* know about the types
of matter.
* know the symbols of
various elements.
* classify elements
into metals, non-metals and metalloids
* compare the properties
of metals and non metals.
* acquire knowledge
about compounds of solids, liquids and gases.
* know about the uses
of compounds in daily life.
Introduction
In the universe all manifestations,
phenomena and evolution of life are caused by matter and energy. All the
objects which exist around us are made of some kind of matter. We perceive
these objects through our senses like sight, touch, hearing, taste and
smelling. A glass tumbler can be seen, agarbatti burning can be recognized by its
smell whereas wind blowing can be felt. All kinds of matter possess mass and
occupy space. Of course some are heavy and others are light. Thus, matter can
be defined as anything which has definite mass and occupies space.
As we know already, matter exists as
solids (wood, stone, sand, iron etc. ), liquids (water, milk, fruit juice, etc.
) and gases (oxygen, nitrogen, carbon dioxide, steam, etc. ) . Matter in any
physical state is composed of smaller particles such as atom,
molecules or ions. An atom is the
smallest particle of an element which exhibits all the properties of that
element. Atoms of the same element or different elements combine to form a
molecule. Atoms or group of atoms having a charge (positive or negative ) are
called ions.
Hence, atoms are the building blocks
of matter. In this lesson, we will study about symbols of elements, metals and
non metals, compounds of solids, liquids and gases, and the uses of compounds
in daily life.
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