metals and non-metals

 metals and non-metals


class 8 and class 10 questions and answer


 PHYSICAL PROPERTIES OF METALS AND NON-METALS

Physical Properties Include Physical State , Lustre , Colour , Hardness , Mallealibity , Ductility , Thermal Conductivity , Eletrical Conductivity ,and Sonority.
  • PHYSICAL STATE
      PHYSICAL STATE MEANS METALS AND NON-METALS ARE SOLID
  AT ROOM TEMPERATURE .


  •                      METALS  Amost  All metals ARE SOLID AT ROOM TEMPERATURE  .MERCURY IS AN EXCEPTION BECAUSE IT IS KNOWN TO OCCUR IN A LIQUID STATE AT OR NEAR ROOM TEMPERATURE                

  • NON-METALS - ALMOST ALL NON-METALS ARE SOLID OR GASES AT ROOM TEMPRATURE .

  • BROMINE  IS THE ONLY NON - METAL THAT IS LIQUID STATE AT ROOM TEMPERATUIRE .

  •   LUSTRE  

LUSTRE MEANS METALS AND NON- METALS GIVE SHINE AND BECAUSE OF THAT IT REFLECT LIGTH.


  • METALS - ' LUSTRE ' OR A SHINY SURFACE IS APROPERTY OF MOST METALS .
 THIS IS BECAUSE METALS CAN BE POLISHED . BECAUSE OF THEIR ABILITY TO SHINE AND REFLECT  LIGTH ,  METALS LIKE GOLD , SILVER ,  AND  PLATINUM ARE USED FOR MAKING JEWALERY AND OTHER DECORETIVE ARTICLES.


  •    NON-METALS - ALMOST ALL NON-METALS ARE HAVE DULL SURFACE . 

AS MOST FO THEM OCCUR AS POWERS AND GASES , THEY CANNOT BE POLISHED LIKE METALS . GRAPHITE (A FORM OF CARBON ) AND IODINE DO SHOW SOME LUSTRE .

  •  COLOUR


COLOUR MEANS THAT THE COLOUR OF METALS AND NON-METALS .



  •   METALS - MOST METALS ARE WHITE OR SHILVERY - GREY . THERE ARE, HOWEVER , A FEW EXCEPTIONS. FOR EXAMPLE , GOLD IS YELLOW AND COPPER IS REDDISH-BROWN.


  •  NON-METALS - SOME NON-METALS ARE COLOURLESS WHILE SOME ARE COLOURED . 
FOR EXAMPLE ,CHLORINE IS A GREENISH-YELLOW GAS,BROMINE
IS A BROWN LIQUID , IODINE IS A VIOLET SOLID AND OXYGEN AND NITROGEN ARE COLOURLESS.

  • HARDNESS

HARDNESS MEANS THAT THE HARDNESS OF METALS AND NON-METALS.


  •     METALS - Most of the metals are hard but some are in exception SODIUM and POTASSIUM are so soft that they can be cut with a knife.
  •  NON-METALS - Non-metals are soft but DIAMPND is a form of carbon ,is an exception .It is the hardest supstance known in the world. 

  • MALLEABILITY

MALLEABILITY MEANS THAT METALS AND NON METALS ARE  CONVERT INTO THIN SHEETS . 


  •   METALS - Most of the metals are beaten into thin sheets or foils.GOLD , SILVER and ALUMINIUM are the common example of this.


  •  NON-METALS - Non-metals are cannot be beaten into thin sheets or foils.

  •  DUCTILITY

DUCTILITY MEANS THAT METALS AND NON-METALS ARE CONVERT INTO THIN WIRES.


  •  METALS - Most  of the metals are can be covert into thin wires because they have a property that they can be convert into thin wires.COPPER, ALUMINIUM , GOLD and SILVER are the common example of this .


  •  NON-METALS - Non-metals are cannot be convert into yhin wires .

  • THERMAL CONDUCTIVITY  

THERMAL CONDUCTIVITY MEANS THAT METALS AND NON-METALS ARE GOOD CONDUCTOR OF HEAT.


  •  METALS - Metals are good conductor of heat ,they are used for making cooking utesils. SILVER is the best conductor of heat , after sivler, COPPER is the good conductor of heat .
NON-METALS - Non-metals are poor conductor of heat ,therefore , DIAMOND good conductor of heat which is in the exception .

  • ELECTRICAL CONDUCTIVITY 



 ELECTRICAL CONDUCTIVITY MEANS THATE METALS AND NON METALS ARE GOOD CONDUCTOR OF ELECTRICITY.  


  •  METALS - Metals are good conductor of electricity and they are used for making electrical wires and cables .


  •  NON-METALS - Non-metals nare poor conductor of good conctor of electricity but graphite is a good conductor of electricity which is in exception.

  • SONORITY


SONORITY MEANS THAT METALS AND NON-METALS PRODUCE A RINGING SOUND .


  •  METALS - When metal object struck with a hard object it make ringing sound because metals have a property of ringing sound .Objects like WIND CHIMES and BELLS make use to produce ringing sound 


  •  NON-METALS - Non-metals dosenot produce ringing sound when they struck with hard object .




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