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MATTER AROUND US
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.
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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