i: Handpicking, Threshing, Winnowing, Sieving.
Answer
ii: evaporation
iii: churning
iv: Distillation
v: The difference in weights of substances.
vi: A solution in which no more substance can be dissolved at a given temperature, is called a saturated solution.
i: the process of fastening sedimentation by adding alum to the water is called Loading.
Answer
It is called so because the suspended light particles become heavy on adding alum.
ii: A pure substance will have a fixed boiling point, a fixed melting point
iii: We can convert it into unsaturated solution by heating the solution.
iv: impure- Air, soil, tea, sea water , salad, oil & water, sea sand
Pure: oxygen , sugar, hydrogen
v: Water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth.
vi:
A mixture may be solid liquid or gas.
Mixture may be homogeneous or heterogeneous in nature
The various substances which are present in a mixture are called its components
vii: The salts , minerals, and other impurities mixed in sea water are not in equal proportion through out the entire quantity of the sea water.
viii: After rain the objects at a distance are seen more clearly because the fine dust particles that were present in air settle down due to loading by rain drops.
i: sieving is a process by which a mixture with components of different sizes are separated. Sieving allows the fine flour particles to pass through the holes of the sieve while the bigger impurities remain on the sieve.
Answer
ii: it is a homogeneous mixture of liquid and liquid.
iii: Glass C will be most saturated as more amount of sugar is added to it.
iv:
v: yes, milk and oil are immiscible liquids and hence can be separated by the process of decantation.
vi: When steam comes in contact with the metal plate cooled with ice, it condenses and forms liquid water.
vii:Handpicking is a separation technique used to remove the unwanted impurities from the mixture by hand. It involves simply picking out substances by hand and separating them form others.Handpicking method can be used when items differ on the basis of color, shape and weight
i.Winnowing
Answer
ii.The process of separating heavier and lighter components of a mixture by wind or by blowing air is called winnowing.
It is commonly done by farmers to separate lighter husk particles from heavier seeds of grain. The farmer allows the mixture of grain and the husk to fall from a height.
iii.
a- direction of the wind
b- soop
c- husk
d- grain
Answer
prepare sugar solution in hot water. Allow the container to cool and filter the solution. Hang a crystal of sugar in this solution with the help of a thread and glass rod. Leave the solution uncovered and undisturbed for few days. It will be observed that crystal of sugar slowly begins to grow.
Answer
i.Evaporation/Distillation & Condensation.
Answer
ii.Salt solution. Sugar solution
The mixture will be a homogeneous mixture.
iii.Pure water.
No, I don’t agree with the above statement.
Answer
We can separate wheat flour from sugar crystals by the method of sieving. The holes in the sieve will allow fine particles of the wheat flour to pass through while the bigger crystals of sugar will remain on the sieve.