Chapter 2 - Is Matter around us Pure
Chapter 3 - Atoms and Molecules
Chapter 4 - Structure of the Atom
Chapter 5 - The Fundamental Unit of Life
Chapter 6 - Tissues
Chapter 7 - Diversity in Living Organisms
Chapter 8 - Motion
Chapter 9 - Force and Laws of Motion
Chapter 10 - Gravitation
Chapter 11 - Work and Energy
Chapter 12 - Sound
Chapter 13 - Why do we fall Ill
Chapter 14 - Natural Resources
Chapter 15 - Improvement in Food Resources
Chapter 2 - Is Matter around us Pure
What is meant by a substance?
How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25°C), which are miscible with each other?
Name the technique to separate butter from curd.
Name the technique to separate salt from sea-water.
Name the technique to separate camphor from salt
What type of mixtures is separated by the technique of crystallization?
Classify the following as chemical or physical changes : Cutting of trees
Classify the following as chemical or physical changes: Melting of butter in a pan
Classify the following as chemical or physical changes:- Rusting of almirah
Classify the following as chemical or physical changes:- Boiling of water to form steam
Classify the following as chemical or physical changes:-
Passing of electric current through water, and water breaking down into hydrogen and oxygen gas
Classify the following as chemical or physical changes:- Dissolving common salt in water
Classify the following as chemical or physical changes:- Making a fruit salad with raw fruits
Classify the following as chemical or physical changes:-Burning of paper and wood
Try segregating the things around you as pure substances or mixtures.
Pages 28 - 30
Which separation techniques will you apply for the separation of the Sodium chloride from its solution in water.
Which separation techniques will you apply for the separation of the Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
Which separation techniques will you apply for the separation of the Small pieces of metal in the engine oil of a car.
Which separation techniques will you apply for the separation of the Different pigments from an extract of flower petals.
Which separation techniques will you apply for the separation of the Oil from water.
Which separation techniques will you apply for the separation of the Tea leaves from tea.
Which separation techniques will you apply for the separation of the 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|
(a) What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?
(b) 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.
(c) Find the solubility of each salt at 293 K. What salt has the highest solubility at this temperature?
(d) What is the effect of change of temperature on the solubility of a salt?
Explain the term Pure substance by giving examples.
Explain the term Colloid by giving examples.
How would you confirm that a colourless liquid given to you is pure water?
Identify the solutions among the following mixtures:-
(b) Sea water
(e) Soda water
Which of the following will show the “Tyndall effect”?
(a) Salt solution
(c) Copper sulphate solution
(d) Starch solution
Which of the following are chemical changes?
(a) Growth of a plant
(b) Rusting of iron
(c) Mixing of iron fillings and sand
(d) Cooking of food
(e) Digestion of food
(f) Freezing of water
(g) Burning of candle
Textbook solutions for Class 9
NCERT solutions for Class 9 Science chapter 2 - Is Matter around us Pure
NCERT solutions for Class 9 Science chapter 2 (Is Matter around us Pure) include all questions with solution and detail explanation from Science Textbook for Class 9. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has created the CBSE Science Textbook for Class 9 solutions in a manner that help students grasp basic concepts better and faster.
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Concepts covered in Class 9 Science chapter 2 Is Matter around us Pure are Suspension, Is Matter Pure (Numerical), Physical and Chemical Changes, Obtain Pure Copper Sulphate from an Impure Sample, Obtain Different Gases from Air, Separate a Mixture of Two Miscible Liquids, Is the Dye in Black Ink a Single Colour, Separate a Mixture of Salt and Ammonium Chloride, Immiscible Liquids, Separate Cream from Milk, Obtain Coloured Component (Dye) from Blue/Black Ink, Colloidal Solution, Properties of a Solution, Solution, Concept of Mixture, Is Matter Pure (Introduction, Mixture), Concentration of a Solution.
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