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Is Matter Around Us Pure

Question

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A body of mass 5 kg is moving with a uniform velocity of 10 m/s. It is acted upon by a force of 20 N. What will be its velocity after 1 s?

Solution

Mass comma space straight m space equals space 5 space kg F o r c e comma space straight F space equals space 20 space straight N therefore space A c c e l e r a t i o n comma space straight a space equals space straight F over straight m space equals space 20 over 5 space equals space 4 space straight m divided by straight s squared Now comma I n i t i a l space v e l o c i t y comma space straight u space equals space 10 space straight m divided by straight s Acceleration comma space straight a space equals space 4 space straight m divided by straight s squared Time space space taken comma space straight t space equals space 1 space straight s space therefore space Final space velocity comma space straight v space equals space straight u plus at space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 10 space plus 4 space cross times 1 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 14 space straight m divided by straight s.

Some More Questions From Is Matter Around Us Pure Chapter

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?

Explain the following giving examples:

Saturated solution

Explain the following giving examples:

Pure substance

Explain the following giving examples:

Colloid

Explain the following giving examples:

Suspension

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