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Is Matter Around Us Pure
Distinguish between a wave pulse and a periodic wave.
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Pulse |
Periodic wave |
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1. A pulse is a wave produced by a sudden disturbance of short duration. |
1. A periodic wave produced by continuous and regular vibrations of the particles of the medium. |
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2. The medium oscillates for a short time and then returns to its undisturbed position. |
2. The medium vibrates for a long time after being disturbed, in a periodic wave. |
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3. The wave forms are not repetitive. |
3. The wave form has a basic pattern which repeats itself after a fixed interval. |
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4. It is formed in a small portion of the medium. |
4. It is stretched over the entire length of the medium. |
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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).
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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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