Is Matter Around Us Pure

Question

Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

Solution

Let, length of the aluminium rod = 'd' metre

Speed of sound in air = 344 ms^-1

Time taken by sound in air to reach the child, t(air) = $\frac{d}{346}$ sec

Speed of sound in aluminium = 6420 ms^-1

Time taken by sound in aluminium rod to reach the child, t (aluminium) = $\frac{d}{6420} s$

Ratio of times taken by sound wave in air to aluminium is given by,

$\frac{t (air)}{t (aluminium)} = \frac{\frac{d}{346}}{d / 6420} = \frac{d}{346} \times \frac{6420}{d} = \frac{6420}{346} = 18.55$

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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

What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?

Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

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

Find the solubility of each salt at 293 K. Which salt has the highest solubility at this temperature?

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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Is Matter Around Us Pure

Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

Some More Questions From Is Matter Around Us Pure Chapter

Which separation techniques will you apply for the separation of the following?

Butter from curd.

Which separation techniques will you apply for the separation of the following?

Oil from water.

Which separation techniques will you apply for the separation of the following?

Tea leaves from tea

Which separation techniques will you apply for the separation of the following?

Iron pins from sand.

Which separation techniques will you apply for the separation of the following?

Wheat grains from husk

Which separation techniques will you apply for the separation of the following?

Fine mud particles suspended in water.

Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

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Loaction

Substance Dissolved	Temperature in K
Substance Dissolved	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

For Daily Free Study Material Join wiredfaculty

Is Matter Around Us Pure

Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

Some More Questions From Is Matter Around Us Pure Chapter

Which separation techniques will you apply for the separation of the following?Butter from curd.

Which separation techniques will you apply for the separation of the following?Oil from water.

Which separation techniques will you apply for the separation of the following?Tea leaves from tea

Which separation techniques will you apply for the separation of the following?Iron pins from sand.

Which separation techniques will you apply for the separation of the following?Wheat grains from husk

Which separation techniques will you apply for the separation of the following?Fine mud particles suspended in water.

Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

Find the solubility of each salt at 293 K. Which salt has the highest solubility at this temperature? 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

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Which separation techniques will you apply for the separation of the following?

Butter from curd.

Which separation techniques will you apply for the separation of the following?

Oil from water.

Which separation techniques will you apply for the separation of the following?

Tea leaves from tea

Which separation techniques will you apply for the separation of the following?

Iron pins from sand.

Which separation techniques will you apply for the separation of the following?

Wheat grains from husk

Which separation techniques will you apply for the separation of the following?

Fine mud particles suspended in water.