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Is Matter Around Us Pure
Give some examples to illustrate the law of conservation of momentum.
The law of conservation of momentum can be illustrated using the following examples:
(i) Recoil of the gun
The bullet and the gun, both are at rest before firing and initial momentum of the system is zero. When the bullet is fired, it moves forward with a large velocity, As per the conservation of momentum, the gun must moves backward with a velocity such that the final mometum is zero.
(ii) Flight of rockets and jet engines:
When a rocket is fired, it throws a stream of burnt gases in the vertically downward direction with a large velocity. So, the outgoing gases have large momentum in the downward direction. According to the law of conservation of momentum, the rocket gets an equal and opposite momentum which causes it to fly up.
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Which separation techniques will you apply for the separation of the following?
Small pieces of metal in the engine oil of a car.
Which separation techniques will you apply for the separation of the following?
Different pigments from an extract of flower petals.
Which separation techniques will you apply for the separation of the following?
Butter from curd.
Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).
|
Substance Dissolved |
Temperature in K |
||||
|
283 |
293 |
313 |
333 |
353 |
|
|
Potassium nitrate |
21 |
32 |
62 |
106 |
107 |
|
Sodium chloride |
36 |
36 |
36 |
37 |
37 |
|
Potassium chloride |
35 |
35 |
40 |
46 |
54 |
|
Ammonium chloride |
24 |
37 |
41 |
55 |
66 |
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