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प्रश्न
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
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उत्तर
The chalk reduces in size after writing on the blackboard. It becomes flat on the side from which we use it for writing.
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संबंधित प्रश्न
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
The property/properties which enable copper metal to be used for making electric wires is/are :
State whether the following statement is true or false :
Sponge is an example of solid sol.
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
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
Gases change to liquid by the process of ______.
Solids do not flow.
Define the term matter.
Define the term matter.
