is matter around us pure class 9 notes
Pure : Pure means that there is no mixing in a
substance. A pure substance is made up same kind of elements .
Example : Water, gold
Mixture : It constitute two of more substance
is any proportion .
Example : Air is mixture of oxygen, nitrogen,
carbon dioxide , tea
Mixture
· Homogeneous
· Heterogeneous
Homogeneous: These mixture has no visible
boundaries of a separation between substance. It is in uniform composition.
Example - sugar in water, salt in water
Heterogeneous: These mixture has visible
boundaries of separation between substances. It is non uniform composition.
Example : sand in water , chalk in water .
Solution: Solution is a homogeneous mixture of two or more substance
.Example: sugar solution, salt solution
Solution has a two component.
·
Solute
·
Solvent
Solute : The substance
that is added to the solvent to form a solution is called a Solute. For
Example, Salt, when mixed in water, acts as a solute for the mixture
Solvent : The substance in which another substance is
mixed is called the Solvent. For Example, Water is a
solvent in which we can mix different substances such as salt or sugar.
Properties of solution ( True Solution )
- The size of solute particle are smaller 10 -9
- Solute particles cannot seen by naked eyes
- Particle do not scatter a beam of light
- Path of beam light not visible in solution
- Stable solution
- Not show the tyndall effect
C Concentration of solution
Dilute solution: Solution that
contain less amount of solute is called dilute solution .
Concentrated solution: solution that contain high amount solute is called concentrated.
Saturated solution: When no more
solute can be dissolved in solution at given temperature then is is called
saturated solution. Saturation of solution increase when temperature increases.
Suspension : A
suspension is a heterogeneous mixture in which solute particle do not dissolve
but remain suspended but remain
suspended. Example : muddy water, chalk in water , milk of
magnesia , paints etc.
Properties of Suspension
- Size of solute partical are big
- Can be seen by naked eyes
- Particle scatter a beam of light
- Path of beam light visible in suspension
- May of may not show tyndall effect
- Unstable solution.