air and water notes grade 5-2

8/18/2019 Air and Water Notes Grade 5-2

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Chapter - Air and Water

Task 1: Enquiry Based Learning-Live

Anil was given a task to separate sugar and water from sugarand water solution.

Could you suggest the method to be used to conduct this

experiment?

Process Success criteria

1. ame of the method.

!. "rite the two processes involved in separating sugar and

water from the sugar and water solution.

#. $raw and label the apparatus neatly.

Ans%

1.$istillation method

!. &vaporation and Condensation.

#. fig. '.' pg '()*+.

Extra questions:

1. &xplain how a doctor,s syringe is filled with medicine from a

medicine bottle.

Ans% "hen the plunger of the syringe is pushed in- there is no airin the syringe. As the plunger is pulled- air pressure forces the

liuid in the medicine bottle to rise up through the needle.

!./ow is the atmosphere useful to us?


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Ans% 1. *he atmosphere sustains life on earth by providing oxygen

for breathing. 0t also provides carbon dioxide to plants for making

food.

!. *he oone layer in the atmosphere absorbs the harmful ultra)

violet rays of the sun and prevents them from reaching us.#. *he atmosphere absorbs the excessive heat of the sun so that the

earth does not get overheated during the day. 0t retains the heat at

night so that the earth does not freee.

2. *he atmosphere helps in recycling water through the water

cycle.

#. "hat are the uses of air pressure in daily life?

Ans% *he principle of air pressure is used in the doctor,s syringes-

in ink fillers- in vacuum cleaners- in hair dryers- in the straw that is

used to drink liuids etc

2. 0n what ways is expired air different from inspired air?

0SP03&$ A03 &4P03&$ A03

itrogen Same Same

5xygen more less

Carbon dioxide less more

"ater vapour 6ariable Saturated

*emperature 6ariable *he same asthat of the body.

7. 8ist the properties of Air.

Ans% 1. Air occupies space.

!. Air exerts pressure.

#. Air has weight.


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2. Air is needed for burning.

'. 8ist the properties of water.

Ans% 1. Pure water has no colour- taste- or smell.

!. "ater is called the 9universal solvent, because it dissolves manythings.

#. 0t,s the only natural substance that is found in all three states of

matter.

2. "ater can absorb a lot of heat. *hat is why it is valuable to

industries.

:. ame the processes used to separate soluble and insolublesubstances from water.

Ans% *he processes used to separate

a. soluble substances are evaporation and distillation.

b. insoluble substances are sedimentation and filtration.

;. "hy should our drinking water be made clean and pure?

Ans< "ater contains many disease germs like bacteria- protooa

and viruses. *hese produce serious diseases in man. So the water

should be made clean and pure for drinking.

(. "hy are the cabins of =et aero planes filled with air and all doors

and windows are sealed before take off?

Ans% /igher in the atmosphere where =et aircrafts fly- the pressureis very low and it is difficult for us to breathe.

>or this reason all high flying aircrafts have pressuried cabins- in

which the pressure of the air is kept the same as that near the

ground.


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1.@ountaineers who climb high mountains- carry air in cylinders

with them. "hy?

Ans% Sufficient air for breathing is present only upto17km above

the earth. *his lower layer of the atmosphere is called the

troposphere. &ven in troposphere air gets very thin higher up and breathing becomes difficult. /ence mountaineers who climb high

mountains carry air cylinders with them.

air and water notes grade 5-2

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