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Tuesday, 11 October 2016

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Compound and mixture; Examples and differences



understand compound and mixture


A Taste of what you’ll Learn
                Basic definition of Compound

              Basic compound and their component element

              Formulae of compounds

             Basic definition of mixtures and examples

             Differences between compounds and mixture


Compound
A compound is formed from the combination of two or more element which are chemically combined together. Examples are marble chips (Caco3), sodium chloride (Na cl), caustic soda or Sodium hydroxide (Na OH), Lime water or calcium hydroxide (Ca(OH)2) e.t.c.
       Note: A compound a formed as a result of chemical changes. Therefore, it is a new substance with entirely different properties from its component element.




        Read more on Elements

Compound and their component Element.

Compound
Component element
Formula
Ammonium hydroxide
Nitrogen, hydrogen and oxygen
NH4 OH
Sand
Silicon and oxygen
SiO2
Ethanol
Carbon, Hydrogen, and oxygen
C2 H5 OH
Glucose
Carbon, Hydrogen, and oxygen
C6 H12O6
Washing Soda
Sodium, carbon, oxygen and hydrogen
Na2CO3 .H2O
Soap
carbon, Hydrogen, oxygen
         C17 H35COO Na  


Formulae of compound

 Compounds Formula of compound can be derived or deduced from the valency of component element or radical. Examples are given below:

Compound
Formulae
Sodium tetraoxosulphate (vi)
     Na2 SO4
Potassium trioxocarbonate (iv)
                    K2CO3
Ammonium tetraoxosulphate (vi)
   (NH4)SO4
Aluminium oxide
   Al2O3
Ammonium hydroxide
   NH4OH
Calcium hydrogen trioxocarbonate (iv)
   Ca(HCO3)2                           
Sodium dioxonitrate
   Na NO2
Calcium trioxonitrate (v)
   Ca (NO3)2
Ammonium trioxocarbonate (iv)
  (NH4)2CO3







                                        Mixture

Mixture is a substance which contains two or more compounds which are physically combined together. Examples:
(a)    Salt and water
(b)   Kerosene and water
(c)    Milk
(d)   Iron filling
(e)   Sulphur
(f)     Sugar solution etc.

Note:  A mixture is a product of physical change. Therefore, it cannot be represented by any chemical equation.



        Differences between compound and mixture


                Compound
Mixture
·         The components of a compound are
The constituent of a mixture are        
Chemically combined.

Physically combined


·         It is homogeneous in nature.

It is heterogeneous in nature.


·         The properties of a compound is individual
The properties is the sum of the

totally different from its component
 Properties of its constituent.
Element.



·         It can be represented by simple chemical
Chemical Equations.
It cannot be represented by simple equations.  


·         The components are in fixed ratio.
The constituents are not in fixed ratio.
 There is an evidence of a chemical reaction
reaction
In a compound. Therefore, it cannot be separated
constituents
by physical means.
There is no evidence of a chemical
In a mixture. Therefore, the
Of a mixture can be separated by
Physical means.      




Conclusion


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