Is Matter around us Pure - Notes - Class 9 PDF Download

 Page 1


CHAPTER - 2 
 
IS  MATTER  AROUND  US  PURE 
 CLASS                             :- IX  
 MADE BY                       :- MANAS MAHAJAN 
 SCHOOL                         :- K.V . GANESHKHIND PUNE-7 
Page 2


CHAPTER - 2 
 
IS  MATTER  AROUND  US  PURE 
 CLASS                             :- IX  
 MADE BY                       :- MANAS MAHAJAN 
 SCHOOL                         :- K.V . GANESHKHIND PUNE-7 
1) Classification of matter :- 
 i) On the basis of the physical state, matter is classified into three main  
    types. They are solids, liquids and gases. 
ii) On the basis of chemical composition matter is classified into two  
    main types. They are pure substances and mixtures. 
    Pure substances are of two types. The are elements and compounds.  
    Mixtures are of two types. They are homogeneous mixtures and  
    heterogeneous mixtures.  
                                                   Matter 
 
                  
              Pure substances                                  Mixtures 
                  
     
 
     Elements            Compounds   Homogeneous      Heterogeneous 
                                                               mixture                  mixture 
Page 3


CHAPTER - 2 
 
IS  MATTER  AROUND  US  PURE 
 CLASS                             :- IX  
 MADE BY                       :- MANAS MAHAJAN 
 SCHOOL                         :- K.V . GANESHKHIND PUNE-7 
1) Classification of matter :- 
 i) On the basis of the physical state, matter is classified into three main  
    types. They are solids, liquids and gases. 
ii) On the basis of chemical composition matter is classified into two  
    main types. They are pure substances and mixtures. 
    Pure substances are of two types. The are elements and compounds.  
    Mixtures are of two types. They are homogeneous mixtures and  
    heterogeneous mixtures.  
                                                   Matter 
 
                  
              Pure substances                                  Mixtures 
                  
     
 
     Elements            Compounds   Homogeneous      Heterogeneous 
                                                               mixture                  mixture 
2) Pure substances and mixtures :- 
 i) Pure substance  :- is a substance which consists of a single type of 
substance (element or compound). 
  Eg:- iron, copper, hydrogen, oxygen, water, sugar, common salt etc. 
ii) Mixture :- is a substance which consists of two or more pure  
substances.   Eg:- sea water, minerals, soil, air,  sand and salt, sugar in  
water, salt in water etc. 
   Differences between pure substances and mixtures :- 
Sl.No. Pure substance Mixture 
1 Pure substance consists of a 
single type of substance  
Mixture consists of two or 
more pure substances. 
2 
 
 
 
3 
 
Pure substance cannot be 
separated into other 
substances by physical 
methods. 
Pure substance has its own 
definite properties. 
 
Mixture can be separated into 
its components by physical 
methods. 
 
Mixture shows the properties 
of its components. 
Page 4


CHAPTER - 2 
 
IS  MATTER  AROUND  US  PURE 
 CLASS                             :- IX  
 MADE BY                       :- MANAS MAHAJAN 
 SCHOOL                         :- K.V . GANESHKHIND PUNE-7 
1) Classification of matter :- 
 i) On the basis of the physical state, matter is classified into three main  
    types. They are solids, liquids and gases. 
ii) On the basis of chemical composition matter is classified into two  
    main types. They are pure substances and mixtures. 
    Pure substances are of two types. The are elements and compounds.  
    Mixtures are of two types. They are homogeneous mixtures and  
    heterogeneous mixtures.  
                                                   Matter 
 
                  
              Pure substances                                  Mixtures 
                  
     
 
     Elements            Compounds   Homogeneous      Heterogeneous 
                                                               mixture                  mixture 
2) Pure substances and mixtures :- 
 i) Pure substance  :- is a substance which consists of a single type of 
substance (element or compound). 
  Eg:- iron, copper, hydrogen, oxygen, water, sugar, common salt etc. 
ii) Mixture :- is a substance which consists of two or more pure  
substances.   Eg:- sea water, minerals, soil, air,  sand and salt, sugar in  
water, salt in water etc. 
   Differences between pure substances and mixtures :- 
Sl.No. Pure substance Mixture 
1 Pure substance consists of a 
single type of substance  
Mixture consists of two or 
more pure substances. 
2 
 
 
 
3 
 
Pure substance cannot be 
separated into other 
substances by physical 
methods. 
Pure substance has its own 
definite properties. 
 
Mixture can be separated into 
its components by physical 
methods. 
 
Mixture shows the properties 
of its components. 
3) Types of mixtures :- 
     Mixtures are of two types. They are homogeneous mixture and 
heterogeneous mixture. 
 i) Homogeneous mixture :- is a mixture which has a uniform  
   composition. 
 - The particles of the mixture are not visible by the naked eye.  
 - The particles cannot be separated by filtration.  
 - The mixture is stable (the particles do not settle down). 
 - The path of a beam of light is not visible in the mixture. 
    Eg :- mixture of sugar in water, mixture of salt in water, mixture of  
             copper sulphate in water etc. 
ii) Heterogeneous mixture :- is a mixture which has a non -  
    uniform composition. 
 -  The particles are visible by the naked eye. 
 -  The particles can be separated by filtration.  
 -  The mixture is unstable (the particles settle down). 
 -  The path of a beam of light is visible in the mixture.  
     Eg :- mixture of salt and sand, mixture of sulphur and iron filings,  
             mixture of oil and water etc. 
Page 5


CHAPTER - 2 
 
IS  MATTER  AROUND  US  PURE 
 CLASS                             :- IX  
 MADE BY                       :- MANAS MAHAJAN 
 SCHOOL                         :- K.V . GANESHKHIND PUNE-7 
1) Classification of matter :- 
 i) On the basis of the physical state, matter is classified into three main  
    types. They are solids, liquids and gases. 
ii) On the basis of chemical composition matter is classified into two  
    main types. They are pure substances and mixtures. 
    Pure substances are of two types. The are elements and compounds.  
    Mixtures are of two types. They are homogeneous mixtures and  
    heterogeneous mixtures.  
                                                   Matter 
 
                  
              Pure substances                                  Mixtures 
                  
     
 
     Elements            Compounds   Homogeneous      Heterogeneous 
                                                               mixture                  mixture 
2) Pure substances and mixtures :- 
 i) Pure substance  :- is a substance which consists of a single type of 
substance (element or compound). 
  Eg:- iron, copper, hydrogen, oxygen, water, sugar, common salt etc. 
ii) Mixture :- is a substance which consists of two or more pure  
substances.   Eg:- sea water, minerals, soil, air,  sand and salt, sugar in  
water, salt in water etc. 
   Differences between pure substances and mixtures :- 
Sl.No. Pure substance Mixture 
1 Pure substance consists of a 
single type of substance  
Mixture consists of two or 
more pure substances. 
2 
 
 
 
3 
 
Pure substance cannot be 
separated into other 
substances by physical 
methods. 
Pure substance has its own 
definite properties. 
 
Mixture can be separated into 
its components by physical 
methods. 
 
Mixture shows the properties 
of its components. 
3) Types of mixtures :- 
     Mixtures are of two types. They are homogeneous mixture and 
heterogeneous mixture. 
 i) Homogeneous mixture :- is a mixture which has a uniform  
   composition. 
 - The particles of the mixture are not visible by the naked eye.  
 - The particles cannot be separated by filtration.  
 - The mixture is stable (the particles do not settle down). 
 - The path of a beam of light is not visible in the mixture. 
    Eg :- mixture of sugar in water, mixture of salt in water, mixture of  
             copper sulphate in water etc. 
ii) Heterogeneous mixture :- is a mixture which has a non -  
    uniform composition. 
 -  The particles are visible by the naked eye. 
 -  The particles can be separated by filtration.  
 -  The mixture is unstable (the particles settle down). 
 -  The path of a beam of light is visible in the mixture.  
     Eg :- mixture of salt and sand, mixture of sulphur and iron filings,  
             mixture of oil and water etc. 
4) True solution :- 
      A true solution is a homogeneous mixture of two or more  
substances. 
    A solution has a solvent and solute as its components.  
The component in the larger amount is the solvent and the  
component in the lesser amount is the solute.  
  Eg :- solution of salt in water, solution of sugar in water, 
iodine in water (tincture iodine), soda water etc. 
 
    Properties of true solutions :-  
  i) True solution is a homogeneous mixture. 
 ii) The particles are cannot be seen by the naked eye. 
iii) The solute particles cannot be separated by filtration. 
iv) The solute particles do not settle down and the solution  
      is stable. 
v ) The particles do not scatter a beam of light passing  
      through it and the path of light is not visible in the  
      solution.