manish bharti roll.no 38

Is matter around us pure ?

QUESTION ÀND ANSWERS

1.WHICH OF THE FOLLOWING TECHNIQUES WILL YOU APPLY FOR THE SEPRATION OF THE FOLLOWING

 I)SODIUM CHLORIDE FROM ITS SOLUTION IN WATER : EVAPORATION

 II) AMMONIUM CHLORIDE FROM A MIXTURE CONTAINING SODIUM CHLORIDE      AND AMMONIUM CHLORIDE : SUBLIMATION

III)SMALL PIECE'S OF METAL IN THE ENGINE OIL OF A CAR : FILTRATION

IV)DIFFERENT PIGMENT FROM AN EXTRACT OF FLOWER PETALS CHROMATOGRAPHY

V) BUTTER FROM CURD : CENTRIFUGATION

VI)OIL FROM WATER : FUNNEL SEPRATION

VII)IRON PINS FROM SAND ::MAGNETIC SEPARATION

2.WRITE THE STEPS YOU WOULD USE FOR MAKING TEA .USE THENWORDS SOLUTION ,SOLVENT, SOLUTE ,DISSOLVE SOLUBLES, INSOLUBLE FILTRATIONS AND RESIDUE.

FIRST WATER IS TAKEN AS SOLVENT IN A SAUCER PAN .THIS WATER IS ALLOWED TO BOIL .DURING HEATING MILK AND TEA ARE ADDED TO THE SOLVENT AS SOLUTES.THEY FORM A SOLUTION THEN THEN SOLUTION REMAINS ON TUE STRAINER AS RESIDUE .SUGAR IS DISSOLVED IN THE FILTRATE.THE RESULTNG SOLUTION IS THR REQUIRED TEA.

4.EXPLAIN THE FOLLOWING GIVING EXAMPLES.

 1.SATURATED SOLUTION :

     There is a limited to the amount of solute that ca dissolved in a fixed amount of a solvent at a particular temperature this is called saturated solution.

FOR EXAMPLE : A SOLUTION IN WHIC MORE SOLUTE CAN BE DISSOLVED

2.PURE SUBSTANCE'S

A SUBSTANCE WHICH IS MADE UP OF ONLY ONE KIND OF PARTICLES.

EXAMPLE : WATER , SULPHUR, HYDROGEN ETC,

 3.COLLOID

IT ISA TYPE OF SOLUTION IN WHICH THE SIZE OF SOKUTE PARTICES IS INTERMEDIATE BETWEEN THOSE OF TRUE AND SUSPENSON SOLUTION

4.SUSPENSIONS

SOLUTION IN WHICH SMALL PARTICLES ARE REMAINS SUSPENDED  IN THE LIQUID.

FOR EXAMPLE : MUDDY WATER, PAINTS

5.CLASSIFY EACH AS HOMOGENEOUS OR HETEROGENEOUS MIXTURES.

SODA : HOMOGENEOUS

WATER:HOMOGENEOUS

WOOD:HETEROGENEOUS

AIR:HOMOGENEOUS

SOIL:HETEROGENEOUS

VINEGAR: HOMOGENEOUS

FIKTERED TEA:HOMOGENEOUS