Advertisements
Advertisements
प्रश्न
Give reasons:
Why a solid does not flow, but a liquid flows?
उत्तर
In solids there is a strong force of attraction between the molecules and the space between them is very negligible. The molecules are therefore, not free to move. They merely vibrate about their mean positions. But in the case of liquids, the molecules are not very closely packed. They do not attract each other as strongly as the molecules of solids. Thus, the intermolecular spaces are larger and the molecules are able to move about more freely. This makes a liquid flow
APPEARS IN
संबंधित प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
When you put some ice cubes in a glass, droplets of water are formed on the outer wall of the glass. This explains the phenomenon of
Explain why, there is no rise in temperature of a substance when it undergoes a change of state though heat is supplied continuously.
When heat is constantly supplied by a gas burner with small flame to melt ice, then the temperature of ice during melting :
The latent heat of vaporisation of water is :
There are four substances W, X, Y and Z. The substance W is a dark violet solid having diatomic molecules. A solution of W in alcohol is used as a common antiseptic C. The substance X is a white solid which is usually recovered from sea water on a large scale. The substance Y is a white solid which is insoluble in water and used in the form of small balls for the safe storage of woollen clothes. The substance Z is a yet another white solid which is used in making commonly used dry cells.
- Name (i) W (ii) X (iii) Y and (iv) Z.
- Out of W, X, Y and Z, which substance/substances can undergo sublimation ?
- Which substance is organic in nature ?
- What is the name of substance C ?
- Which substance belongs to the halogen family ?
What happens to a metal ball when it is heated? What does this show?
Write whether the following statement is true or false:
A gas has no free surface.
Explain the term vaporization
Explain the term melting point
Explain the term boiling point
