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प्रश्न
Name the terms for the particles of matter which may or may not have independent existence.
उत्तर
this criteria is shown by atoms of any matter which may exist alone (like helium) or may not exist alone and exist in molecular form (like oxygen/o₂ )
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संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
What are the characteristics of matter?
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
The three important metalloids are.............................. and ..........................
State two physical properties on the basis of which metals can be distinguished from non-metals.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
Name a metal which can be easily cut with a knife.
What is the most common way of expressing the concentration of a solution ?
In what respects does a true solution differ from a colloidal solution ?
Explain what happens when a beam of light is passed through a colloidal solution.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
Define Aerosol Give one example.
What is meant by a solution ? Give two examples of solutions.
Which among the following ______ will get attracted to by magnet?
The property which allows the metals to be hammered into their sheets is ______.
Which among the following is not a matter?
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Atoms or groups of atoms having a charge are called ______.
Liquids cannot be compressed and they have fixed volume.
Define the term matter.
