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प्रश्न
Which of the following statement is incorrect?
विकल्प
the particles of matter are very, very small
the particles of matter attract one another
the particles of some of the matter are moving constantly
the particles of all the matter have spaces between them
उत्तर
The particles of some forms of matter move constantly
The statement that the particles of some forms of matter move constantly is incorrect because the particles of matter of all three states– solid, liquid and gas –are moving constantly. Although the particles of solids are fixed at their positions, they vibrate constantly.
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संबंधित प्रश्न
What are the two conditions for the interconversion of states of matter ?
Write whether the following statement is true or false.
Only water can exist in three different states.
Match the following
| Column A | Column B |
| (a) Solids | (1) Can flow in all directions. |
| (b) Sublimation | (2) The temperature at which a liquid changes into its gaseous state. |
| (c) Boiling point | (3) Any number of free surfaces. |
| (d) Gases | (4) Gaps between particles. |
| (e) Intermolecular space | ro(5) Change of state fm solid to gas. |
There are large intermolecular gaps in
- water
- iron ball
- common salt
- air
Fill in the blank
When a gas is cooled, its molecules ________ energy,
A solid is a state of matter that has
Explain the following :
When an incense stick is lighted in the corner of a room, its fragrance spreads quickly in the entire room.
When a beam of sunlight enters a room through a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases) Y which are moving rapidly in a very haphazard manner.
- What could particles X be ?
- Name the gas (or mixture of gases) Y.
- What is the phenomenon exhibited by particles X known as ?
- What is causing the movement of particles X ?
- What conclusion does the existence of this phenomenon give us about the nature of matter ?
Describe simple experiment to show that particles of matter are closely packed in solids and less in liquids.
Among the following ______ is not a mixture.
