Advertisements
Advertisements
Question
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
Solution
- 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
RELATED QUESTIONS
What do you observe when a gas jar which appears empty is inverted over a gas jar containing Bromine vapours? Name the phenomenon.
Fill in the blank:
Water is a matter because it has mas and occupies....................
Write whether the following statement is true or false.
If the container in which a gas is collected has an opening, the gas will flow out and spread itself indefinitely.
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. |
Which of the following is a property of the liquids ?
- they can flow
- they are malleable
- they have a definite shape
- they are rigid
What is volume ?
Name the three states of matter.
State in which of the three states of matter:
The space between the particles is minimum.
Match the characteristics of the three states of matter in List I with their correct answer from List II.
| List I | List II |
| 1. Have no definite shape, volume or free surface | A: Solids only |
| 2. Are highly compressible and least rigid | B: Liquids only |
| 3. Have a definite volume, no definite shape and are slightly diffusable | C: Gases only |
| 4. Are not compressible and have no diffusability | D: Liquids and gases only |
| 5. Have mass and occupy space | E: Solids and gases only |
| F: Solids, liquids and gases |
200 ml of water is poured into a bowl of 400 ml capacity. The volume of water will be ______.
