A simple PPT on Separation of substances for kids of cbse class 6 , science. All the aspects and definition covered as mcq and simple Q/A

1. SEPARATION
OF
SUBSTANCES
CBSE CLASS 6 SCIENCE
IMPORTANT Q/A

2. Mixtures contain more than one molecule of
substance
Ex: Lemonade – Lemon juice, sugar and
water
Tap water – Water, dissolved salts
Sea water - Several salt mixed with water
Milk – Water, cream etc
Wood – Cellulose and water
Air – Mixture of several gases such as
oxygen, carbon di oxide, nitrogen, Argon,
water vapour etc.
www.morescorecbse
.com

3. Pure substances: When substance contain more
than one type of atom/ molecule it is called as Pure
substance Ex: sugar, salt crystals
Different substances present in a mixture is called
as components/Constituents
www.morescorecbse
.com

4. Various properties of Mixture:
 Constituents of mixture may be in any
ratio
 Constituents retain their individual
properties in mixture
 Constituents can be separated by simple
methods
 A pure compound has a fixed melting and
boiling point www.morescorecbse
.com

5. Why separation is necessary?
1. To remove the unwanted items that may enter
our body and cause illness
Ex: Separating stones from rice before cooking
Separating chillies in food before kids eating
2. Filtration of river water is done to remove
harmful substances before they are supplied to
our homes
www.morescorecbse
.com

6. Respirator devices are used to remove
unwanted components from air and to supply
oxygen to the patient
Crude oil/petroleum is a mixture of several
useful constituents
Petrol, kerosene, diesel, tar are obtained by
separating crude oil
www.morescorecbse
.com

7. Properties commonly used to separate solid
from mixture of solids.
Size, shape, Magnetic properties and
solubility
Method used to remove impurities from water
for drinking purpose is called as Reverse
osmosis
Germs are killed by adding chlorine to the
water
www.morescorecbse
.com

8. Separating funnel is used to separate the two
immiscible liquids
Two miscible liquids that have different boiling
points are separated by Fractional distillation
The solubility of sugar in water increases with
increase in temperature
www.morescorecbse
.com

9. Importance of Water as Solvent
Since water can dissolve a large number of
substances in it, it is called as Universal Solvent
Human body:
Food is reduced to simple substances, dissolved in
water and are absorbed by body
Waste material produced in the body are dissolved
in the water and excreted out
www.morescorecbse
.com

10. Plants:
• Plants absorb nutrients from soil that are
soluble in water
• Minerals from root and food from leaves are
transported to different part of plant in the form
of solutions
www.morescorecbse
.com

11. Dissolved Oxygen and Carbon dioxide:
Gases such as Oxygen and carbon dioxide are
soluble in water and important for survival of
aquatic life
Fishes breathe in the dissolved oxygen in water
through gills
Aquatic plants use dissolve carbon dioxide in water
for photosynthesis www.morescorecbse
.com

12. • Carbon dioxide dissolved in aerated
drinks used to give tangy taste
• Solubility of gases in water
decreases with increase in
temperature
www.morescorecbse
.com

13. • Indians was prohibited from
producing and selling salt before
independence.
• Dandi March by Gandhiji on 6th Apr
1930, from Sabarmati ashram to town
Dandi on Coast of Arabian Sea
www.morescorecbse
.com

14. Check out for cbse class 5, 6
handnotes as
mcq:
https://www.morescorecbse.com/20
21/12/links-for-cbse-class-5-6-
notes.html
Check out for more Reasoning
Questions
https://www.morescorecbse.com/20
21/12/reasoning-questions-
link.html