Table of contents | |
What is Matter? | |
Physical Nature of Matter | |
Characteristics of Particles of Matter | |
Classification of Matter | |
Activity |
Anything that occupies space and has mass is called matter. In other words, they have both mass and volum
The particle nature of matter can be demonstrated by a simple activity.
Void: When we add salt to the water, it goes into that void. As a result, we do not see any change in volume.
Activity
Kinetic energy: Kinetic energy of an object is the measure of the work an object can do by virtue of its motion. The kinetic energy is 1/2 mv2. To accelerate an object, we have to apply force. To apply force, we need to do work. When work is done on an object, energy is transferred, and the object moves with a new constant speed. We call the energy that is transferred kinetic energy, and it depends on the mass and speed achieved.
Examples:
Activity
Activity
Note:
Material: The term used to describe a particular kind of matter is called material.
Examples: Wood, Water and Marble.
Note:
- Solids generally do not exhibit diffusion due to smaller inter-particle spaces and the absence of translatory motion.
- Some examples in which solids show diffusion:
(i) If we write something on a blackboard and leave it uncleaned for a considerable period of time (say, at least 10 to 15 days), we will find that it becomes quite difficult to clean the blackboard afterwards. This is due to the fact that some of the particles of chalk have diffused into the surface of backboard.
(ii) If two metal blocks are bound together tightly and kept undisturbed for a few years, then the particles of one metal are found to have diffused into the other metal.
Evaporation an Example of Gaseous Matter
For further topics in the lesson, check out this link - Changes in States of matter and Evaporation.
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1. What is matter? |
2. What are the characteristics of particles of matter? |
3. What are the different classifications of matter? |
4. How does the physical nature of matter affect its behavior? |
5. What is the nature of particles of matter in our surroundings? |
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