How would you confirm that a colourless liquid given to you is pure water ?

Question:

Answer:

Pure water boils at 100°C (373K) at atmospheric pressure and salt water boils above 100°C temperature. If the liquid boils at 100°C at atmospheric temperature then it is a pure water otherwise it is impure.

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10 gram sodium nitrate is dissolved in 35 gram saturated solution of sodium nitrate at 25°C temperature. Calculate solubility of sodium nitrate.

Classify the following into elements, compounds and mixtures.

Which of the following will show ‘Tyndall effect’ ? (a) Salt Solution (b) Milk (c) Copper Sulphate Solution (d) Starch Solution

Identify the solution among the following mixtures. (a) Soil (b) Sea Water (c) Air (d) Coal (e) Soda

Which of the following things are pure substances? (a) Ice, (b) Milk, (C) Iron, (d) Hydrochloric Acid, (e) Calcium oxide, (f) Mercury, (g) Brick, (h) Wood, (i) Air.

Classify each of the following as a homogeneous or heterogeneous mixture. Soda water, wood, air, soil, vinegar, filtered tea and ice.

Pragya tested the solubility of three different substances at different temperatures and collected the data as given below.

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

Try segregating the things around you as pure substances or mixture.

Classify the following as chemical are physical changes.

To make a saturated solution 36g of sodium chloride is dissolved in 100 g of water at 293K. Kind its concentration at this temperature.

How are solution and suspension are different from each other ?

List the Points of differences between homogeneous and heterogeneous mixtures. OR Differentiate between homogeneous and heterogeneous mixtures with examples

What is meant by substances ?

Chapter 2

Question:

Answer:

Class 9 Important Questions

NCERT Solutions for Class 9

Chapter 2

Question:

Answer:

Class 9 Important Questions

NCERT Solutions for Class 9

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