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Is matter pure
Is matter pure?
chapter-3

Textual Questions and Answers

Ans:-

Mixture Separation techniques
a) Sodium chloride from its solution in water. Evaporation
b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride. Sublimation
c) Small pieces of metel in the engine oil of a car Filration
d) Different pigments from an extract of flower petails. Chromatography
e) Butter from curd Centrifugation
f) Oil from water Using separting funnel or Distillation
g) Tea leaves from tea Filtration
h) Iron pins from sand magnetic sepration
i) Wheat grains from husk Sieing or winnowing
j) Fine mud particles suspended in water Filtration

Ans:-
A) Saturated solution :- The uniform mixture formed when a miximum quantity of solute dissolves in solvent is called saturated solution.
Ex:- Carbonated water
B) Pure substance :- A pure substance is one that contains particles of only one typeof a substance.
Ex:- Gold,water
C) Colloid :- A colloid is a heterogeneous mixture with small size particles which are not visible but the particles can scatter the light.
Ex :-smoke, blood
D) Suspension :- a suspension is a heterogeneous mixture with big particles which are visible.And the particles can scatter the light.
Ex:- Sandy and water, Oil and water

Ans:-
1) The given colourless liqid should not have smell.
2) No particles or babools suspendeed in it.
3) Also it should not greasy
4) if the path of light ray is not visible When we send a light ray through the given colourless liquid, than we decide that it is pure water.

Ans:-
(a) Ice – It is pure substance. Which ever part of Ice consists of Water molecules only.
(b) Milk – It is a mixture of cream and milk. so it is not a pure substance.
(c) Iron – It is pure substance. Which ever part of Iron consists of Iron particles only.
(d) Hydrochloric acid – It is a mixture of Hydrogen chloride gas and water. so, it is not pure substance.
(e) Calcium oxide – It is pure substance. Any part of Calcium oxide consists of one type of molecules.
(f) Mercury – It is pure substance. every part of Mercury consists of Mercury molecules only.
(g) Brick – It is a mixture of components like clay, water and ash. so, it is not pure substance.
(h) Wood – It is not pure substance. Wood consists of so many organic matter. It is a mixture.
(i) Air – It is not pure substance. Air is a mixture of so many gases like oxygen, Nitrogen etc...

Ans:-
a) Soil - Not a solution
b) Sea water - Solution
c) Air - Solution
d) Coal - Not a solution
e) Soda water - Solution

Ans:-
Classification :-

Homogeneous mixture Heterogeneous mixture
Soda water Wood
Air Soil
Filtered tea ...
Vinegar ...
Reason:- In homogeneous mixture the particles of components are uniformly distributed and we cannot see them separately. Reason:- In heterogeneous mixture the particles of components are not uniformly distributed and we can see them separately.

Ans:-
a) Sodium - Element
b) Soil - Mixture
c) Sugar solution - Mixture
d) Silver - Element
e) Calcium carbonate - Compound
f) Tin - Element
g) Silicon - Element
h) Coal - Mixture
i) Air - Mixture
j) Soap - Compound
k) Methane - Compound
l) Carbon dioxide - Compound
m) Blood - Mixture

Ans:-
Classification of substances:

Solution Suspension Colloid dispersion
Ink Fruit saladNail polish
Soda water Oil and waterBoot polish
Brass... Milk
Black coffee ... Blood
air...Aerosal spray
......Fog
......Starch solution

Ans:-
Mass of salt (solute) = 20g
Mass of solution = 100g

mass persentage = (
mass of the Solute
mass of the solution
 ) x 100
mass persentage = (
20
100
 ) x 100
mass persentage = (
20
100
) x 100

mass persentage = 20%

Ans:-
Mass of potassium chloride (solute) = 2.5g
Mass of potassium chloride solution = 50ml

mass persentage = (
mass of the Solute
mass of the solution
 ) x 100
mass persentage = (
2.5
50
 ) x 100
mass persentage = (
2.5
50
) x 100 2

mass persentage = 5%

Ans:-
i) Salt solution, and Copper sulphate solution are true solutions.
ii) starch solution and Milk are colloids. So they can show Tyndall effect.
iii) Take each liquid in separate beakers.
iv)Take a focus light or a spot light and try to pass the light ray through the them(liquids) one after another and observe the path of the light.
v)The path of the light is visible only in starch solution and Milk, this indicates that they are scattering the light which is passing throught them. so, they shows the Tyndall effect.
vi) Where as the Salt solution, and Copper sulphate solution does not show Tyndall effect.

Ans:-
i) Take three beakers and fill them with a solution, a Colloid and a suspension respectively.
ii)Take a focus light or a spot light and try to pass the light ray through the them(liquids) one after another and observe the path of the light.
iii)The path of the light is visible only in colloids and suspensions, this indicates that they are scattering the light which is passing throught them. so, they shows the Tyndall effect.
iv) Where as the solution does not show Tyndall effect.

Ans:-
The major difference between the apparatus of distillation experiment and fractional distillation experiment is the fractionating column. Fractionating column is fitted in between the distillation flask and the condenser.

Distillation experiment apparatus:



Fractional Distillation experiment apparatus:

Ans:-
i) Take a bowl and keep it over the flame.
ii) pour some water in it. Water is solvent .
iii) Add required amount of tea powder. tea powder is solute.
iv) let it boil for sometime.
v) extracts of tea powder dissolves in water.
vi) Add required amount of milk and sugar.
vii) Sugar is soluble in water and it is an another solute.
viii) Filter the prepared tea with sieve.
ix) The insoluble tea powder remains as residue in the sieve.
x) The filtrated tea is a solution which containing water, milk, sugar and extracts of tea powder.

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