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प्रश्न
Give one difference between atoms and molecules.
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उत्तर
Atoms may or may not have independent existance. While molecules have independent existence.
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संबंधित प्रश्न
"A substance has a definite shape as well as a definite volume." Which physical state is represented by this statement?
Classify the following into solids, liquids and gases.
Oxygen, milk, common salt, wax, stone, L.P.G, carbon- dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.
Fill in the blanks:
______ and ______ can flow.
For the following statement, say whether it describes a solid, a liquid or a gas.
Particles move about very quickly but do not leave the surface
State the main physical properties of matter.
See the given pictures and write down the state of each object. (Solid, Liquid, Gas)
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| _____ | ______ | ______ | ______ | ______ |
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| ______ | _______ | ______ | ______ | ______ |
Discuss briefly on three states of matter.
In solids, the space between the particles is less than in ______.
Solids are compressible.
A strong current of trivalent gaseous boron passed through a silicon crystal decreases the density of the crystal due to part replacement of silicon by boron and due to interstitial vacancies created by missing Si atoms. In one such experiment, one gram of silicon is taken and the boron atoms are found to be 1000 ppm by weight, when the density of the Si crystal decreases by 12%. The percentage of missing vacancies due to silicon, which are filled up by boron atoms will be ____ g. [Given · Atomic wt. Si= 30, B = 11]
