Advertisements
Advertisements
प्रश्न
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 ?
Advertisements
उत्तर
- The particles, 'X' are dust particles.
- Gas 'Y' is Air.
- This phenomenon being exhibited by 'X' particles is called the Brownian motion.
- The fast moving air molecules are constantly hitting the tiny dust particles, causing them to move rapidly in a very haphazard manner.
- The gaseous matter ‘air’ is made up of tiny particles that are constantly moving.
APPEARS IN
संबंधित प्रश्न
Give two example of the following:
The substances which do not change their state on heating.
Classify the following into solids, liquids and gases.
Oxygen, milk, common salt, wax, stone, water vapour, carbon-dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.
What are the two conditions for the interconversion of states of matter ?
For the following statement, say whether it describe a solid, a liquid or a gas.
Particles are quite close together.
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. |
Write your observation and conclusion for the following,
When a small stone is gently dipped into a glass filled with water.
Fill in the blank with the correct word Given below.
The space between atoms’ [molecules] of solids is ____
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 why –
Liquids have a definite volume but no definite shape.
In which of the three states of matter – solids, liquids, or gases is the movement of atoms about their own position. Give a reason for the same.
