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Atoms And Molecules

Question
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Define weight of a body. Write an expression for it.

Solution

The force with which a body is attracted towards the centre of the earth is known as the weight of a body. 

When a body falls towards the earth, the gravitational force of the earth produces an acceleration 'g' in the motion of the body.

According to Newton's second law, the force of attraction on the body of mass m is,

F = Mass x Acceleration due to gravity
  = mg

This force is known as the weight of the body.

So substituting weight(W) with F, we get

                          W = mg  

The weight of a body varies from place to place, as 'g' varies. 

Some More Questions From Atoms And Molecules Chapter

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 ?

What are the postulates of Dalton’s atomic theory of matter?

Hydrogen and oxygen combine in two different ways to produce water and hydrogen peroxide. Which of Dalton’s law does this observation confirm? Explain.

State drawbacks of Dalton’s atomic theory of matter.

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