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प्रश्न
Describe simple experiments to prove that gases occupy space.
उत्तर
occupy space
Experiment:
‘A’ – A glass beaker or bowl is half-filled with water.
‘B’ – An empty glass tumbler [which of course contains air] is inverted a lowered inside it.
‘C’ – On tilting the tumbler, the air is displaced and bubbles are seen coming out.
Conclusion: Air or gases occupy space.
संबंधित प्रश्न
Give two reasons to justify that An iron almirah is a solid.
Give reasons
When an empty gas jar is inverted over a gas jar containing a coloured gas, the gas also spreads into the empty jar
Give reasons
A red ink drop added to small amount of water in a glass turns the water red in some time.
Fill in the blanks:
Any matter which has a definite ______ but no definite shape is called a ______.
For the following statement, say whether it describes a solid, a liquid or a gas.
Particles are quite close together
To identify materials of common use
Procedure – Just move around in your house – in the drawing room, sitting room, bedroom, kitchen, bathroom etc. Identify the things and All in the blanks in the table given below
| No. | Place | Name of the thing | Material used for making the thing |
| 1 | Study room | ||
| 2 | Drawing room | ||
| 3 | Kitchen | ||
| 4 | bathroom | ||
| 5 | Any other place |
Strainer is a kind of sieve which is used to separate a liquid from solid.
Match the following.
| Srl. no. | A | B | C |
| i | Separation of visible undesirable components | Water mixed with chalk powder | Magnetic Separation |
| ii | Separation of heavier and lighter components | Sand and water | Decantation |
| iii | Separation of insoluble impurities | Iron impurities | Filtration |
| iv | Separation of magnetic components from non-magnetic components | Rice and stone | Hand-picking |
| v | Separation of solids from liquids | Husk and paddy | Winnowing |
What is the physical state of water at 250°C.
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]
