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Is Matter Around Us Pure

Question
CBSEENSC9006605
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A stone is dropped into a well, 44.1 metres deep. The sound of the splash is heard 3.13 seconds after the stone is dropped. Find the velocity of sound in air.

Solution

The time t taken by the stone to reach the water level in the well by using the relation,
straight s space equals space ut space plus space 1 half at squared space We space have comma space straight s space equals space 500 space straight m space comma space straight u space equals space 0 comma space straight g space equals space 10 space straight m divided by straight s squared space That space is comma space space space space space space space space space 500 space equals space 0 plus space 1 half cross times 10 cross times straight t squared space rightwards double arrow space space space space space straight t squared space space equals space 500 over 5 space equals space 100 space That space is comma space straight t space equals space 10 space sec space Time space taken space by space sound space to space travelfrom space base space to space the space tower space to space it apostrophe straight s space top straight t apostrophe space equals space fraction numerator Distance over denominator Speed space of space sound end fraction space equals space 500 over 340 equals space 1.47 space straight s Total space time space after space which space the space splash space is space heard comma space straight t subscript 1 space equals straight t space plus space straight t to the power of apostrophe space space space space equals space 10 space plus space 1.47 space space space space space equals space 11.47 space sec

Some More Questions From Is Matter Around Us Pure Chapter

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

Oil from water.

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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?

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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.

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


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 is the effect of change of temperature on the solubility of a salt?

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