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Atoms And Molecules
Question
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Give some examples of the gravitational force in nature.

Answer

The gravitational force plays an important role in nature. Below are mentioned some examples where gravitaional force comes into play:  

1. All the planets revolve around the sun due to the gravitational force between the sun and the planets. Thus, the gravitational force is responsible for the existence of the solar system.

Fig. Our solar system. Gravitational force holds together the sun and the planets.

2. The motion of the moon around the earth is due to the gravitational force between the moon and the earth.

3. Tides in oceans are formed due to the gravitational force between the moon and the water in oceans. 

4. The earth holds the atmosphere (envelope of gases) near its surface due to its gravitational force.
5. The gravitational force of the earth is responsible for rainfall and snowfall.

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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 ?