☰
✕

Atoms And Molecules
Question
Wired Faculty App

Briefly explain how can Archimedes' principle be verified experimentally?

                                     Or

Describe a simple activity to show that a body loses weight when immersed in a fluid.

Answer

Archimedes principle can be explained experimentally. 
Look at the fig. below.

Fig. 10.22. Verification of Archimedes' principle.

i) Take an overflow can and fill it with water.
ii) Hang a piece of stone on spring balance.
iii) Weigh the piece of stone hung from the spring balance.
iv) Take a beaker and weigh it.
v) Place the beaker below the spout of the overflow can.
vi) Immerse the stone in the overflow can and collect the water which overflows and read the weight of stone when it is immersed in water.
vii) We find that, the weight of stone in water is less than the weight of stone in air.
viii) Now weigh the beaker with the water.
ix) It is observed that the loss in weight of the stone is equal to the weight of the water collected in the beaker, i.e., the weight of the water displaced.
Hence, Archimedes principle is proved. 

 

Sponsor Area

Some More Questions From Atoms And Molecules Chapter

Give the names of the elements in the following compounds.

(a) Quick lime
(b) Hydrogen bromide
(c) Baking powder 
(d) Potassium sulphate.

Calculate the molar mass of the following substances:

(a) Ethylene
(b) Sulphur molecule, S8
(c) Phosphorus molecule, P4
(d) Hydrochloric acid, HCl
(e) Nitric acid, HNO3.

What is the mass of:

(a) 1 mole of nitrogen atoms

(b) 4 moles of aluminium atoms

(c) 10 moles of sodium sulphite.

Convert into mole

(a) 12 gm of oxygen gas

(b) 20 gm of water

(c) 22 gm of carbon dioxide.

What is the mass of?

(a) 0.2 mole oxygen atoms.

(b) 0.5 mole of water molecules.

Calculate the number of molecules of sulphur (S8) present in 16 gm of solid sulphur.

Calculate the number of aluminium ions present in 0.56 gm of aluminium oxide.

Explain law of conservation of mass.

50 g of 10% lead nitrate is mixed with 50 g of 10% sodium chloride in a closed vessel. After the reaction has taken place, it was found that 6.83 g of lead chloride was precipitated. Besides, the reaction mixture contained 90 g water and sodium nitrate. Calculate the amount of sodium nitrate formed.

Name and explain two important laws of chemical combination ?