This chemistry lesson discusses pure substances and mixtures. It defines a pure substance as having the same type of particles throughout and being either an element or compound based on its chemical composition. Elements are substances that cannot be broken down further, while compounds are formed by two or more elements chemically combining in fixed ratios. Mixtures are formed when two or more pure substances are combined but do not chemically react to form a new substance. The document outlines the key properties of elements and compounds versus mixtures and provides examples of each.

1. CHEMISTRY
LESSON 2
Is Mater Around Us Pure

2. TOPICS
Physical and Chemical Change.
Pure Subtance and types of pure
sutance.
Mixture and types of mixture.
Different Mixture and Compound
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3. PURE SUBTANCES
AND TYPES
A SUBTANCES WHICH IS HAVING SAME
PARTICES .
ON THE BASIC OF THEIR CHEMICHAL .
EXAMPLE : -
COMPOSTION , SUBTANCES CAN BE
CLASSIFIED EITHER AS ELEMENT OR
COMPOUND.
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4. 1.1 ELEMENT
ROBERT BOYLE WAS THE FIRST
SCIENTIST TO USE THR TERM ELEMENT .
ANTOINE LAURENT LAVOISER [1743 - 1794]
, A FRENCH CHEMIST WAS THE FRIST TO
ESTABISH AN EXPERIMENTALLY USEFUL
DEFINITION OF AN ELEMENT
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5. TYPES OF
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TYPES OF
ELEMENT
PROPERTIES
METAL THEY HAVE LUSTRE , DUCTILE ,
MALLABLE , SONOROUS. THEY HAVE
COLOUR SLIVERY –GOLD OR GOLDEN
– YELLOW .THEY ARE GOOD
CONDUTOR OF HEAT AND ELECTRICTY.
EXAMPLE : GOLD , SIVER , COPPRER
,IRON.
NON – METAL THEY DONOT HAVE LUSTRE , DUCTILE
, MALLABLE , SONOROUS. THEY HAVE
VARIETY COLOUR . THEY ARE POOR
CONDUTOR OF HEAT AND ELECTRICTY.
EXAMPLE : OXYGEN, IODIEN , CARBON
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6. 1.2 COMPOUND
A COMPOUND IS A SUBTANCE
COMPOSED MAKED OF TWO OR MORE
ELEMENTS . THEY CHEMICALLY
COMIBNED IN FIXED
POSTION .
EXAMPLE : WATER , CARBON DIOXIDE ,
AMMONIA , FABRIC .
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7. MIXTURES
A COMPOUND IS A SUBTANCE
COMPOSED MAKED OF TWO OR
MORE COMPOUND . A NEW
COMPOUND IS NOT FORMED.
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8. DIFFERENT BETWEEN MIXTURE
AND COMPOUND
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9. SUMMARY
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10. THANK YOU
K.INESH
CLASS 9
SEC B
ROLL NO : 24
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