Page 119 - Science Class 6 Times Publication

e. Fine wheat our is separated from unground wheat grains and
other unwanted particles by

i. Winnowing ii. Filtration

iii. Sieving iv. Decantation

2. Answer these questions in very short:

a. What is a substance?
b. Are impure substances always harmful?
c. Give any two examples of pure substances.
d. Name any two solids that are soluble in water.

e. Is milk a pure substance? If not, why?
f. What is the size of particles in a solution?
g. Name the method suitable to separate the mixture of rice and
husk.

h. What is a sieve?
3.Write down the method of separation for the following

mixtures:

a. Sand and water
b. Rice grains and husk

d. Iron llings and sugar
e. Soil and water
f. Common salt and water
g. Wheat grains and husk

h. Rice and pea seeds

4. Separate the pure and impure substances:

Water from a river, wheat our, cold drink, sugar, gold, copper,

soil, ne rice grains, brine
5. Separate the homogeneous and heterogeneous mixtures:

Water and kerosene, water and alcohol, water and salt, water and
sand, sand and sugar, kerosene and petrol, oil and water, oil and
salt, milk, gum, blood, syrup

Times' Crucial Science and Environment 115 Book 6