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प्रश्न
When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?
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उत्तर
The spreading of fragrance of incense stick from a corner to the whole room indicates that particles of matter keep moving from higher to lower concentration.
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संबंधित प्रश्न
Give reasons for the following observation:
The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.
When sodium chloride is added to a definite volume of water and stirred well, a solution is formed, but there is no increase in the level of water. Why?
Why can a piece of chalk be broken easily into smaller pieces while a coal piece cannot be broken easily?
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. |
Match the columns.
| (1) iron and gold | (a) molecules are very far apart |
| (2) melting | (b) pure substance |
| (3) intermolecular space | (c) non - metals |
| (4) compound | (d) the space between the molecules |
| (5) gases | (e) change from solid to liquid |
| (f) metals |
The state of matter which has no definite shape or volume is called
- solid
- liquid
- gas
- water
Fill in the blank with the correct word Given below.
The space between atoms’ [molecules] of solids is ____
Name the three states of matter.
State in which of the three states of matter:
The movement of the particles is neither about their own positions nor in any random direction.
Give a reason for the following:
Liquids have one free upper surface only.
