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TNPSC Free Notes Chemistry – Elements and Compounds Part 1

இந்தக் கட்டுரையில், TNPSC குரூப் 1, குரூப் 2, குரூப் 2A, குரூப் 4 மாநிலப் போட்டித் தேர்வுகளான TNUSRB, TRB, TET, TNEB போன்றவற்றுக்கான  முறைகள் இலவசக் குறிப்புகளைப் பெறுவீர்கள்.தேர்வுக்கு தயாராவோர் இங்குள்ள பாடக்குறிப்புகளை படித்து பயன்பெற வாழ்த்துகிறோம்.

Elements and Compounds


  • Anything that occupies space
  • Have mass and volume

State of Matter

  • Solid
  • Liquid
  • Gas
  • Plasma
  • Bose Einstein Condensate


  • In solid, the particles are tightly packed with very little space between them.
  • The interatomic space is very high.
  • Eg. Stone


  • Particles in liquids are arranged in a random or irregular way and the space between the particles is greater than that in solids.

Eg. water

  • Liquid atoms are packed more loosely which allows things to be able to pass through it
  • Liquid is effected by gravity more than anything
  • Liquids are always moving due to gravity around it


  • The particles in the gases are arranged far apart. They move freely.
  • Eg. Air
  • A gas atoms are spread out so far, you can walk through it without any restriction
  • Gas is not affected by gravity
  • The gas’s atoms never stop moving and it never stays in place .


  • Superheated gaseous state
  • Example: Lightning, Aurora, Sun & star

Bose Einstein Condensate

  • Super cooled solids
  • Near absolute zero (0 K or -273.15 degree Celsius) 

Composition of Matter

  • Atom (smallest particle of an element)
  • Example: C, N, O, Na
  • Molecules (smallest particle of pure substance)
  • Example: O2, O3

Classification of matter

Pure substance

  • A pure substance is made up of only one kind of particles.
  • Pure substances may be elements or compounds.


  • A Mixture is an impure substance and contains more than one kind of particles.
  • In the mixture the components are mixed in any proportion.



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