Advertisements
Advertisements
Question
Describe a simple experiment to illustrate that molecules are not at rest, but they constantly move.
Advertisements
Solution
Take a beaker. Fill it partly with water. Add some lycopodium powder in the beaker containing water. Stir the contents of the beaker with a glass rod. Take out a few drops of this suspension on a glass plate. Place it on the table and illuminate it with a table lamp. Observe the glass plate through a microscope. It is found that the fine particles of lycopodium powder move rapidly in a random manner and their path is zig zag as shown in the figure below.
APPEARS IN
RELATED QUESTIONS
Name the smallest particle from which matter is made up.
Define the following term Element .
Write whether the following statement are true or false.
There is no difference between evaporation and boiling.
The molecules of each substance are identical.
Give reason :
A red ink drop added to a small amount of water in a glass turns water red in some time.
Write true or false for the statement. Rewrite the false statement correctly.
The smallest part of an element capable of independent existence is called an atom.
Match the column.
| Column A | Column B |
| 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. changes from solid to liquid |
| f. metals |
Solids retain their volume even when external pressure is applied. This property is called ______.
Particles of matter possess energy due to their random motion. Compare the particles in a solid, liquid and in gas with reference to the amount of kinetic energy possessed by each.
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
