CBSE Class 9 Science Is Matter around Us Pure assignment

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Assignment for Class 9 Science Chapter 2 Is Matter Around Us Pure

Class 9 Science students should refer to the following printable assignment in Pdf for Chapter 2 Is Matter Around Us Pure in Class 9. This test paper with questions and answers for Class 9 Science will be very useful for exams and help you to score good marks

Chapter 2 Is Matter Around Us Pure Class 9 Science Assignment

Question : What is meant by a pure substance?
Answer : Substance having single type of particles is known as pure substance.
For example:Hydrogen, Water etc., are pure.
Note:All elements and compounds are considered to be pure.
 
Question : List the points of differences between homogeneous and heterogeneous mixtures.
Answer :  Homogeneous mixture
Its constituent’s particles cannot be seen easily. 
There are no visible boundaries of separation in a homogeneous mixture.
Its constituents cannot be easily separated.
Examples: Alloys, solution of salt in water etc.
Heterogeneous mixture
Its constituent particles can be seen easily.
Have visible boundaries of separation between the constituents.
Its constituents can be separated by simple methods.
Examples: Mixture of sand and common salt, mixture of sand and water etc.
 
Question : Differentiate between homogeneous and heterogeneous mixture with example.
Answer : Same as above answer.
 
Question : How are sol, solution and suspension different from each other?
Answer : Solution or true solution is homogeneous.
NO Tyndall effect.
Solute particles cannot be filtered by using a filter paper
True solution is transparent.
Examples: Sea water, alloys, solution of lemon juice in water etc.
Sol (colloidal solution) :
Sol or colloidal solution is heterogeneous.
Tyndall effect.
Cannot be separated by ordinary filter paper.
It may be transparent or translucent.
Examples: Milk of magnesia, cough syrup, mist, fog, clouds, smoke, mud etc.
Suspension :
Suspension is also heterogeneous.
Tyndall effect.
It may be transparent or translucent.
Separated easily by filter paper.(because of large particles)
Examples: Mixture of sand in water, mixture of chalk in water.
 
Question : To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
Answer : Mass of sodium chloride (solute) = 36 g
Mass of water (solvent) = 100 g
We know that, mass of solution = mass of solute + mass of solvent
= 36 g+ 100 g= 136 g
Concentration (mass percentage) of the solution
= Mass of Solute/Mass of Solution x 100 
=36g/ 136 g x 100 = 26.47% 
 
Question : 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?
Answer :  Simple distillation is the method which can separate the mixture of kerosene and petrol (b.p. differ by more than 25°C).
Method:In a distillation flask, a mixture of kerosene and petrol is taken as shown in figure. The mixture is heated slowly and the temperature is recorded with the help of thermometer. Petrol
(b.p. = 70° C to 1200 ° C) vaporizes first and the temperature becomes constant for some time (till all petrol evaporates from the mixture).
Vapours of petrol are condensed and collected in another container while the kerosene remains in the distillation flask. As soon as the temperature starts’ rising again, the heating is stopped and both the components are collected separately.
 
Question : Name the technique to separate
(i) Butter from curd
(ii) Salt from sea water
(iii) Camphor from salt
Answer : (i) By using centrifugation method, butter can be separated from curd.
(ii) By using evaporation method, salt from sea water can be separated . Water vaporises on evaporation leaving behind the salt.
(iii) Camphor from salt can be separated by sublimation method. On subliming camphor will be converted into vapour leaving behind the salt.
 
Question : What types of mixtures are separated by the technique of crystallisation?
Answer : Crystallisation method can be used for the purification of those mixtures which Contain insoluble and/or soluble impurities. Have crystalline nature.
Cannot be separated by filtration as some impurities are soluble.
 
Question : Classify the following as chemical or physical changes
(a) Cutting of trees,
(b) Melting of butter in a pan,
(c) Rusting of almirah,
(d) Boiling of water to form steam,
(e) Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases,
(f) Dissolving common salt in water,
(g) Making a fruit salad with raw fruits, and
(h) Burning of paper and wood
Solution : Physical Change : Cutting of trees
Melting of butter in a pan Boiling of water to form steam Dissolving common salt in water Making a fruit salad with raw fruits
Chemical Change : Rusting of almirah.
Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases.
Burning of paper and wood.
 
 
Question : Try segregating the things around you as pure substances or mixtures.
(a) Wood
(b) Coal
(c) Milk
(d) Sugar
(e) Common salt
(f) Soap
(g) Soil
(h) Rubber
Answer : (a) Mixture
(b) Mixture
(c) Mixture
(d) Pure substance
(e) Pure substance
(f) Compound/mixture
(g) Mixture
(h) Pure substance
 
Exercises
 
Question : Which separation techniques will you apply for the separation of the following?
(a) Sodium chloride from its solution in water.
(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
(c) Small pieces of metal in the engine oil of a car.
(d) Different pigments from an extract of flower petals.
(e) Butter from curd.
(f) Oil from water.
(g) Tea leaves from tea.
(h) Iron pins from sand.
(i) Wheat grains from husk.
(j) Fine mud particles suspended in water.
Answer :
(a) Evaporation
(b) Sublimation
(c) Filtration
(d) Chromatography.
(e) centrifugal machine or churning the curd by hand.
(f) Decantation
(g) Filtration.
(h) Magnetic Separation.
(i) Winnowing.
(j) Coagulation and decantation:
 
Question : Write the steps you would use for making tea. Use the words solution, solvent,solute, dissolve, soluble, insoluble, filtrate and residue.
Answer : Method of preparation of tea
(i) Take some water (solvent) in a pan and heat it.
(ii) Add some sugar (solute) and boil to dissolve the sugar completely the obtained homogeneous mixture is called solution.
(iii) Add tea leaves (or tea) in the solution and boil the mixture.
(iv) Now add milk and boil again.
(v) Filter the mixture through the tea stainer and collect the filtrate or soluble substances, i.e., tea in a cup. The insoluble tea leaves left behind as residue in the 8 trainer.
 
Question : 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).
(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. Which salt has the highest solubility at this temperature?
(d) What is the effect of change of temperature on the solubility of a salt?
Answer :  (a) Mass of potassium nitrate needed to produce its saturated solution in 100 g of water at 313 K = 62 g
Mass of potassium nitrate needed to produce its saturated solution in 50 g of water at 313 
K = 62/ 100 x 50g = 31g
(b) Crystals of potassium chloride are formed. This happens as solubility of solid decreases with decreasing the temperature.
(c) Solubility of each salt at 293 K
Potassium nitrate 32 g per 100 g water
Sodium chloride 36 g per 100 g water
Potassium chloride 35 g per 100 g water
Ammonium chloride 37 g per 100 g water
 
Note:Solubility of a solid is that amount in gram which can be dissolved in 100 g of water (solvent) to make saturated solution at a particular temperature.
Ammonium chloride has the maximum solubility (37 g per 100 g of water) at 293 K.
 
(d) Solubility of a (solid) salt decreases with decrease in temperature while it increases with rise in temperature.
 
Question : Explain the following giving examples.
(a) Saturated solution
(b) Pure substance
(c) Colloid
(d) Suspension
Answer : (a) Saturated solution:A solution in which no more amount of solute can be dissolved at a particular temperature is called saturated solution.
Example: when sugar is dissolved repeatedly in a given amount of water, a condition is reached at which further dissolution of sugar is not possible in that amount of water at room temperature.
(b) Pure substance: A substance made up of single type of particles (atoms and/or molecules) is called pure substance. All elements and compounds are said to be pure, Example: water, sugar etc.
(c) Colloid:A heterogeneous mixture in which the solute particle size is too small to be seen with the naked eye, but is big enough to scatter light is known as Colloid. There are two phases in colloidal solution Dispersed phase: solute particles are said to be dispersed phase
Dispersion medium: the medium in which solute particles are spread is called the dispersion medium.
Example: Milk, clouds etc., are the example of colloid.
(d) Suspension: A suspension is a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium. Particles of suspension are visible to the naked eye.
Example: Mixture of sand, Water and Muddy water etc.
 
Question : Classify each of the following as a homogeneous or heterogeneous mixture. Soda water, wood, air, soil, vinegar, filtered tea.
Answer : Homogeneous mixtures: Air, soda water, vinegar, filtered tea.
Heterogeneous mixtures: Wood, soil,
 
Question : How would you confirm that a colorless liquid given to you is pure water?
Answer : If the given colorless liquid boils at 100°C sharp, it is pure water, otherwise not.
 
Question : Which of the following materials fall in the category of a "pure substance"?
(a) Ice (b) Milk (c) Iron
(d) Hydrochloric acid (e) Calcium oxide (f) Mercury
(g) Brick (h)Wood (i) Air
Answer : Ice, iron, calcium oxide, mercury are pure substance as they have definite composition.
Milk is a colloid, so it is a heterogeneous mixture.
Hydrochloric acid is also a mixture of hydrogen chloride gas and water.
 
Question : Identify the solutions among the following mixtures.
(a) Soil
(b) Sea water
(c) Air
(d) Coal
(e) Soda water
Answer : Sea water, air and soda water: Homogeneous mixture Coal, Soil: Heterogeneous solution.
 
Question : Which of the following will show "Tyndall effect"?
(a) Salt solution
(b) Milk
(c) Copper sulphate solution
(d) Starch solution
Answer :  Milk and starch solution will show "Tyndall effect" as both of these are colloids.
 
Question : Classify the following into elements, compounds and mixtures.
(a) Sodium (b) Soil (c) Sugar solution
(d) Silver (e) Calcium carbonate (f) Tin
(g) Silicon (h) Coal (i) Air
(j) Soap (k) Methane (l) Carbon dioxide
(m) Blood
Answer :  Elements : Sodium, silver, tin and silicon
Compounds : Calcium carbonate, methane, and carbon dioxide Mixtures : Soil, sugar solution, coal, air, soap and blood.
 
Question : Which of the following are chemical changes?
(a) Growth of a plant
(b) Rusting of iron
(c) Mixing of iron filings and sand
(d) Cooking of food
(e) Digestion of food
(f) Freezing of water
(g) Burning of a candle
Answer : Growth of a plant, rusting of iron, cooking of food, digestion of food, burning of a candle are chemical changes, because here the chemical composition of substance changes.

Exam Questions NCERT Class 9 Science Chapter 2 Is Matter Around Us Pure

Question : Name the types of mixtures.
Ans : Homogeneous mixture and heterogeneous mixture.

Question : Define dispersion medium.
Ans : It is the component which is present in excess and acts as a medium in which colloidal particles are dispersed.

Question : A colloid which have liquid as dispersed phase and solid as dispersion medium called-
Ans : Gel.

Question : The component of solution that is present in smaller proportion
Ans : Solute.

Question : (i) State the principle of the process of centrifugation.
(ii) List any three applications of centrifugation.
Ans : (i) Centrifugation is the process of separating suspended particles from a liquid like colloids by churning the liquid at a high speed. The principle is that denser particles are forced to the bottom and lighter stay at the top when spun rapidly.
(ii) Applications of centrifugation :
(a) Used in dairies and homes to separate cream from milk or butter from cream.
(b) Used in washing machines to squeeze out water from clothes.
(c) Used in laboratories to separate colloidal particles from their solutions.
(d) Used in diagnostic labs for blood and urine test.

Question : Why is water considered as compound?
Ans : Water is considered as compound because :
(i) Water is composed of two elements : hydrogen and oxygen.
(ii) The ratio of hydrogen and oxygen by mass in any sample of pure water is the same.
(iii) The properties of water are different from its constituent elements : hydrogen and oxygen.
(iv) Water can be decomposed by chemical means only


Question : Write characteristics of compounds.
Ans : Characteristics of compounds :
(i) Compounds are the substances formed by chemical combination of two or more elements.
(ii) The constituent elements are present in a fixed ratio.
(iii) A chemical reaction takes place during the  formation of a compound.
(iv) Properties of a compound are different to those of its elements.
(v) Constituent elements cannot be separated by physical processes.

Question : Give two examples of colloids from your daily life.
Ans : Milk and fog.

Question : Give natural example of mixture.
Ans : Sea water, minerals, soil.

Mark (1)

Q 1 Name the process which can be used to recover sugar from an aqueous sugar solution.

Q 2 What happens when a saturated solution is heated ?

Q 3 Name the process you would use to separate a mixture of water and alcohol.

Q 4 Give an example of an aqueous solution in which gas is dissolved.

Q 5 What is the cause of Tyndall effect as shown by colloid?

Q 6 How would you confirm that a colourless liquid given to you is pure water?

Q 7 Give two examples of colloidal solution.

Q 8 Name the technique to separate -
(a) Salt from sea water
(b) Butter from curd

Q 9 What is crystallization ?

Q 10 What is a saturated solution ?

Q 11 What is solution?

Marks (2)

Q 12 Which process would you use to separate colours in a dye ? Define the process.

Q 13 Fog and cloud are both colloidal in nature . How do they differ ?

Q 14 A compound is regarded as a pure substance but a mixture is not. Give reasons.

Q 15 What is sublimation ? Write two examples of sublimating substances.

Q 16 What do you understand by filtration ? Give one example also.

Q 17 Define colloid. Give one example also.

Q 18 What is meant by a suspension ? Write one example also.

Q 19 Define solution. Name its constituents also.

Q 20 What is meant by a mixture ? Write an example also.

Q 21 What do you understand by a pure substance? Give one exmaple also.

Q 22 What are suspensions?

Q 23 Define Alloys. Give one exmaple also.

Marks (3)

Q 24 (i) A solution has been prepared by dissolving 5 g of urea in 95 g of water. What is the mass percent of urea in the solution ?
(ii) Will blood show Tyndall effect?

Q 25 Classify the following into elements , compounds and mixtures-
(a) Soil (b) Magnesium (c) Salt solution (d) carbon dioxide (e) Gold (f) Methane

Q 26 How will you separate iron filings and ammonium chloride from the mixture of both with sand?

Q 27 How will you separate a mixture of mercury, water and benzene ?

Q 28 Write three differences between physical changes and chemical changes.

Q 29 Differentiate between homogeneous and heterogeneous mixtures.

Q 30 What are the two types of pure substances ? Explain.

Q 31 Write three properties of a colloid.

Q 32 (i) A solution contains 20 g of common salt in 160 g of water. Calculate the concentration in terms of mass percentage of the solution.
(ii) Can we separate a mixture of ammonium chloride and napthalene by sublimation? Give reasons also.

Q 33 Give three examples of solutions and mention th e solute and solvent present in them.

Q 34 (i) A solution contains 40 g of sugar dissolved in 360 g of water. Calculate the concentration of this solution.
(ii) Name the technique used to separate cream from milk.

Marks (5)

Q 35 Write 5 differences between compound and mixture.

Q 36 Write 5 properties of a true solution.

Q 37 (i) To make a saturated solution, 42g of sodium chloride is dissolved in100 g of water at 293K. Find its concentration at this temperature.
(ii) Name a domestic fuel which is (a) homogeneous (b) heterogeneous.

Q 38 Write 5 differences between a mixture and a compound.

Q 39 (a) Classify silver as metal or non-metal and write its four properties.
(b) If you have an iron rod and a plastic rod, which of them will produce sound when hit with an object?
(c) Differentiate copper and oxygen on the basis of their volume.
(d) Name the metal which is liquid at room temperature.

Q 40 (a) Classify sulphur as metal or non-metal and write four of its properties.
(b) Name –
(i) a non-metal which is a good conductor of electricity
(ii) a non-metal which is liquid at room temperature.
(iii) Name a non-metal that has lustre.

Q 41 (a) Classify a mixture of sugar in water as solution, colloid or suspension and write its six properties.
(b) Give one example each of solid solution and gas solution.
(c) Write the physical state of solute and solvent present in amalgam.

Q 42 (a) Is milk a pure substance? Give reasons also.
(b) Classify 24 carat gold as pure or impure substance. Give reasons also.
(c) Name two metalloids.
(d) Why carbon dioxide is classified as compound not as mixture?
(e) Write one example each of homogeneous mixture and heterogeneous mixture.

Q 43 (a) Give two reasons for why it is necessary to separate components of mixture of rice and small stones.
(b) Name the techniques used for:
(i) squeezing out water from clothes in washing machine.
(ii) separating components of ink.
(c) Kerosene oil and water do not mix with each other. What is the special name used to describe such liquids?
(d) You have a mixture of ammonium chloride and sodium chloride. Name the method you will use to separate them and why?

Q 44 (a) How will you separate the components of ink using chromatography? Explain with the help of a labelled diagram.
(b) What is the function of glass beads present in fractionating column?
(c) Which method out of evaporation and crystallisation is a better technique to separate sugar from sugar solution? Give reasons also.

Most Important Questions

Q 1 Gold can be drawn in wire. Name the property.

Q 2 Between sulphur and copper which one you will use for making wire.

Q 3 Silver is best conductor of electricity still the electrical wires are made of copper and aluminium. Why?

Q 4 (i) Name a soft metal.
(ii) Name the element present in diamond.
(iii) Name a non-metal having shining surface.
(iv) Name an element used as semi conductor

Q 5 Why metalloids are used as semiconductors?

Q 6 Why metals are used in making instruments like bells, tanpura and violin?

Q 7 Non-metals are bad conductors of electricity. Name a non metal which is conductor of electricity and is used in making electrodes.

Q 8 Is diamond element or compound? Write its composition.

Q 9 Non- metals are usually soft. Do you know any hard non-metal? If yes ,name it.

Q 10 From the following list make two separate lists one for physical changes and other for chemical changes.
baking of bread, switching of electric bulb, curdling of milk, dissolving sodium chloride in water, photosynthesis, rusting of iron, evaporation of water, formation of dew, sublimation of camphor, burning of charcoal or LPG, clotting of blood, crystallization of sugar, ripening of fruit, cooking of vegetables, melting of wax,

Q 11 Why water is a compound not a mixture?

Q 12 Which of the following will show properties of its constituents?
Methane or soil

Q 13 Name solute in brass

Q 14 Particle size of a substance was 50 nm. Is it solution or colloid or suspension

Q 15 A solution is prepared by dissolving 12g of sodium chloride in 150 g of solution. Calculate the mass percentage of solution.

Q 16 The properties of Solution, colloid and suspension are different from each other. Why?

Q 17 Name the solvent present on tincture of iodine.

Q 18 sample of vinegar has 40 gram of acetic acid in 140 ml of water. Calculate mass by volume percentage of the solution.

Q 19 Air is mixture of many gases. Is there any gas I it which acts as solvent? If yes name it and give reasons to support your answer.

Q 20 Write one example each of the following
(i) Aerosol
(ii) Emulsion
(iii) Foam
(iv) Sol
(v) Gel

Q 21 What is toned milk? Name the process and apparatus used to prepare toned milk in dairy.

Q 22 How will you separate the mixture of pebbles and bits of papers.

Q 23 Describe how will you separate the mixture of sand and sugar.

Q 24 Which of the following mixtures cannot be separated by sublimation?
(a) Mixture of ammonium chloride and sodium chloride
(b) Mixture of sugar and iodine
(c) Mixture of sodium chloride and anthracene
(d) Mixture of ammonium chloride and benzoic acid.

Q 25 Write the name of technique used to separate the mixture of engine oil and small pieces of metal.

Q 26 What is the principle of centrifugation?

Q 27 Name the process used to prepare the crystals of pure copper sulphate. Give reasons also.

Q 28 Name the process used to separate different gases from air.

Q 29 Mud is separated from muddy water by adding a chemical. Name it.

Q 30 There are many methods of separation of components of mixture. How will you decide which is the best method for separating constituents of given mixture?

Q 31 How will you separate the constituents of mixture of water, edible oil, and common salt

Q 32 Separate the constituents of mixture comprising of chalk powder, ammonium chloride and iron pieces.

Q 33 A liquid mixture has two liquids A and B. The boiling point of liquid A is 560C and that of liquid B is 700 C. Name the process by which these liquids can be separated.

Q 34 Why crystallization is better technique than evaporation

Q 35 Name the processes used to make river water fit for drinking

Chapter 01 Matter In Our Surroundings
CBSE Class 9 Science Matter in Our Surroundings Assignment Set A
CBSE Class 9 Science Matter in Our Surroundings Assignment Set B
Chapter 02 Is Matter Around Us Pure?
CBSE Class 9 Science Is Matter around Us Pure assignment
Chapter 03 Atoms and Molecules
CBSE Class 9 Science Atoms and Molecules assignment
Chapter 04 Structure Of The Atom
CBSE Class 9 Science Structure of the Atom assignment
Chapter 05 The Fundamental Unit Of Life
CBSE Class 9 Science The Fundamental Unit of Life Assignment Set A
CBSE Class 9 Science The Fundamental Unit of Life Assignment Set B
Chapter 06 Tissues
CBSE Class 9 Science Tissues Assignment Set A
CBSE Class 9 Science Tissues Assignment Set B
Chapter 07 Diversity In Living Organisms
CBSE Class 9 Science Diversity in Living Organisms assignment
Chapter 08 Motion
CBSE Class 9 Science Motion Assignment Set A
CBSE Class 9 Science Motion Assignment Set B
Chapter 09 Force and Laws Of Motion
CBSE Class 9 Science Force and Laws of Motion Assignment Set A
CBSE Class 9 Science Force and Laws of Motion Assignment Set B
Chapter 10 Gravitation
CBSE Class 9 Science Gravitation Set A
CBSE Class 9 Science Gravitation Set B
Chapter 11 Work and Energy
CBSE Class 9 Science Work and Energy assignment
Chapter 12 Sound
CBSE Class 9 Science Sound Assignment
Chapter 13 Why Do We Fall Ill?
CBSE Class 9 Science Why do we Fall ill Assignment
Chapter 14 Natural Resources
CBSE Class 9 Science Natural Resources assignment
Chapter 15 Improvement In Food Resources
CBSE Class 9 Science Improvement in Food Resources assignment
More Assignments for Class 9 Science
CBSE Class 9 Science Collection of Assignments
CBSE Class 9 Science OTBA Clean Air Shared Concern assignment
CBSE Class 9 Science OTBA Environment Development From Hills assignment
CBSE Class 9 Science Physics Question bank

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CBSE Class 9 Science Chapter 2 Is Matter Around Us Pure Assignment

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Assignment for Science CBSE Class 9 Chapter 2 Is Matter Around Us Pure

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Chapter 2 Is Matter Around Us Pure Assignment Science CBSE Class 9

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Chapter 2 Is Matter Around Us Pure Assignment CBSE Class 9 Science

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CBSE Science Class 9 Chapter 2 Is Matter Around Us Pure Assignment

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