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प्रश्न
Explain how, the smell of food being cooked in the kitchen reaches us even from a considerable distance.
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उत्तर
The smell of food cooked in the kitchen reaches us even from a considerable distance because the tiny particles of the vapour of food mix with the air and move continuously in all directions. This process is called diffusion.
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संबंधित प्रश्न
The mass per unit volume of a substance is called density.
(density = mass/volume).
Arrange the following in order of increasing density-
air, exhaust from chimneys, honey, water, chalk, cotton and iron.
Give a reason for the following observation.
Naphthalene balls disappear with time without leaving any solid.
Arrange the following substances in increasing order of forces of attraction between particles -
water, sugar, oxygen
Name two gases which are supplied in compressed form in homes and hospitals.
Give one example of diffusion of gases in a liquid.
______ is not affected by gravity.
Comment upon the following:-
fluidity
Explain why?
- A gas fills a vessel completely?
- Camphor disappears without leaving any residue.
Two gases A and B having molecular weights 60 and 45 respectively are enclosed in a vessel. The wt. of A is 0.50 g and that of B is 0.2 g. The total pressure of the mixture is 750 mm. The partial pressure of the gases B is ______ mm Hg.
A gaseous mixture of He and O2 is found to have a density of 0.518 gL-1 at 25° C and 720 torr. The mass percent of helium in this mixture is ______.
