CBSE Class 9 Science Preparation Of Mixture And Compound Worksheet

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Worksheet for Class 9 Science Preparation Of Mixture And Compound

Class 9 Science students should refer to the following printable worksheet in Pdf for Preparation Of Mixture And Compound in Class 9. This test paper with questions and answers for Class 9 will be very useful for exams and help you to score good marks

Class 9 Science Worksheet for Preparation Of Mixture And Compound

Physical Change
 Changes which involve a change in the physical properties of a substance.
 Formation of a new substance does not take place during a physical change.
 Most physical changes can be reversed easily
 The chemical composition of the substance undergoing a physical change remains the same.

 Chemical Change
 Changes which involve a change in the chemical composition of a substance, undergoing the change
 Formation of one or more new substances takes place during a chemical change.
 Most chemical changes can not be reversed easily.
 The chemical composition of the substance undergoing a chemical change does not remain the same
 Chemical changes are always accompanied by a change in energy

Pure substance can be classified as elements or compounds.

Element: The basic form of matter that cannot be broken down into simpler substances by chemical reactions’.

Elements can be further classified as metals, non-metals, metalloids and noble gases.

Compound: Compounds are formed when two or more elements combine chemically in a fixed proportion.

• Mixture

1. Mixtures refer to those substances which consist of two or more elements or
compounds, mixed together in any ratio and do not give rise to new compound. For
example: sea water, air, chocolate milk etc.

2. Mixture is composed of two or more substances mixed together in any ratio i.e. the
composition is variable and do not possess properties like fixed melting or boiling
point.

3. Mixture shows the properties similar to that of its constituents and they can be
separated by using physical and chemical methods.

4. There are two types of mixtures:
i. Homogeneous mixtures: Such mixtures have only one phase. They have the
same composition throughout and there is no visible separation of line between the
constituents. For example: sugar solution, vinegar etc.
ii. Heterogeneous mixture: Mixtures which has more than one phase is known as
heterogeneous mixture. There is a visible boundary of separation between the
components and they do not have the same composition throughout.

5. Homogeneous mixtures are of three types: (i) Solid homogeneous mixture (alloys),
(ii) Liquid homogeneous mixture (solution of alcohol in water) and (iii) Gaseous
homogeneous mixture (air).

6. Heterogeneous mixtures are of three types: (i) Solid heterogeneous mixture
(mixture of sand and sugar), (ii) Solid-liquid heterogeneous mixture (solution of chalk in water) and (iii) Gaseous heterogeneous mixture (smoke in air).

 Substance – Cannot be separated into its constituent particles by any physical process

 Solution – Homogeneous mixture of two or more substances

 Alloys – Homogeneous mixture of metals

 Solution:
 The component of the solution that dissolves the other component in it is called solvent (present in larger amount).
 The component of the solution that is dissolved in the solvent is called solute (present in lesser quantity).

Properties of solution:
 Homogeneous mixture
 Particles are extremely small, not visible to the naked eye
 Light path not visible
 Solute particles cannot be separated by filtration

 Suspension
 Heterogeneous mixture of solids and liquids
 Solid particles suspend throughout the medium

 Properties
 Heterogeneous mixture
 Particles visible by the naked eye
 Light path visible
 Particles settle down
 Solute particles can be separated by filtration

 Example – sand in water

• Separation process

• Evaporation – For mixture of volatile solvents and non-volatile solutes

Centrifugation – Cream from milk
 Uses
 In diagnostic laboratories for blood and urine tests
 In dairies and homes for separation of butter from milk
 For drying wet clothes

• Separating funnel – Immiscible liquids are separated out in layers (oil and water, slag in iron extraction)

Sublimation process
 Sublime solids
 Ammonium chloride
 Camphor
 Naphthalene
 Anthracene

 Chromatography – To separate those solutes that dissolve in the same solvent
 To separate
 Colours in dye
 Pigments from natural colour
 Drugs from blood

Distillation – To separate two miscible liquids that boil without decomposition (acetone + water)

Fractional distillation
 When the boiling temperature difference is less than 25 K
 (Different factions from petroleum products)
 Air components are separated by fractional distillation

Crystallization – Process to separate pure solids from a solution by forming crystal (copper sulphate from an impure sample)
 Uses – Purification of salt
 Separation of alum from an impure sample

Solvent extraction − Process to separate substances using an appropriate solvent based on the soluble nature of the components of mixture (salt + sand)

 

PREPARATION OF MIXTURE & COMPOUND

Experiment No: ……4……. Date: ………..

Objective: To prepare (a) mixture and (b) a compound using iron filings and sulphur powder and distinguish between these on the basis of:

(a) Appearance (homogeneity and heterogeneity); (b) Behaviour towards magnet

(c) Behaviour towards Carbon disulphide (CS2); (d) Effect of heat.

Requirements: China dish, test tubes, test tube holder, mortar and pestle, watch glasses, magnet, Bunsen burner, iron filings, tripod stand, wire gauze, sulphur powder, CS2 etc.

Procedure:

1. Take 7 g of Iron filings and 4 g of sulphur powder and mix them well using mortar and pestle. Transfer half of this into watch glass no-1

2. Take half of this mixture in a china dish heat strongly on a Bunsen burner (Use tripod stand and wire gauze) till the mixture starts to show a red glow.

3. Cool the mixture, and grind into fine powder using a mortar and pestle.

4. Transfer the powder to watch glass no-2.

5. Perform the following experiments with the samples you have in both the watch glasses.

Properties of mixture of iron &sulphur

EXPERIMENTOBSERVATIONINFERENCE
Dip a magnet in the mixture of substancesOnly iron powder/filing gets
attracted by the magnet
Iron has magnetic properties but sulphur does not.
Observe the substances under a magnifying glassBrown/black iron powder and yellow coloured sulphur powder can be easily distinguished.Because it forms a heterogeneous mixture
Try to dissolve the mixture in 2 ml of CS2 taken in a test tube.Yellow coloured sulphur dissolves. Fe does not.Sulphur is soluble in CS2

Properties of compound of iron &sulphur

EXPERIMENTOBSERVATIONINFERENCE
A small portion of the mixture is taken on china dish and heat
strongly on a Bunsen flame
A reaction takes place with the
emission of an offensive smelling
gas. Sulphur also catches fire.
Finally the yellow colour of S disappears and a brown substance is formed.
Fe + S → FeS (Ferrous sulphide)
Some sulphur also gets burned
results in the formation of
offensive smelling SO2 gas.
Observe the product formed after heating under a magnifying glassOnly a brown coloured powder is
seen
On reacting Fe and S combine to
form a compound, which is homogeneous.
Dip a magnet in the product formed.Substance does not get attracted by the magnetFeS is diamagnetic (Does not show magnetic behaviour)
Take the product formed in a test tube, add CS2 and shake
well.
The substance (FeS) does not
dissolve in CS2
FeS is insoluble in CS2

Precautions:
1. Heating of the Fe & S mixture should be done with extreme care.
2. While performing the experiments, use only very little quantity of the samples.
3. Use china dish for heating the mixture.

Questions:

1. Name the compounds formed when the following chemicals react:
a) Hydrogen and Oxygen
b) Mg and S
b) S and Fe
d) Fe and Cl2.

2 Classify the following into homogeneous and heterogeneous mixtures.
a) Sand and saw dust
b) Sugar dissolved in water.
c) Milk
d) Powders of Fe and S

3 Suggest suitable physical methods to separate the following mixtures:
a. Fe and S Magnet
b. NaCl and water Evaporation/Boiling
c. Sand and water Filtration

4 Classify the following into compounds, elements and mixture:
a. Air b. CO2 gas, c. Fe metal d. S powder f. Sugar solution e. Ethane
f. Fe + S g. NaCl h. SO2 gas. i. H2S gas j. Ammonia gas k. Milk

Multiple choice type questions

1 On heating a mixture of iron filings & sulphur ,it is observed that
a) Sulphur starts melting
b) iron filings start melting
c) mixture becomes red hot
d) mixture evaporates

2 When dilute sulphuric acid is added to a mixture of iron filings & sulphur owder ,it is observed that
a) A brisk reaction takes place without evolution of gas
b) A brisk reaction takes place with the evolution of a colourless gas
c) The yellow colour of sulphur disappears
d) Gas with the smell of rotten egg is evolved

3 A small amount of iron sulphide is added to 5 cc of carbon di sulphide and the test tube is shaken vigourously, it is seen that
a) Grey coloured iron particles dissolve,but not sulphur
b) Yellow coloured sulphur particles dissolve, but not iron
c) Both iron &sulphur dissolve to form a clear solution
d) None of the particles of the compound dissolves.

4 When a mixture iron &sulphur powder is reacted in a china dish ,then after some time it glows with
a) Yellowish colour
b) Bluish colour
c) Greenish colour
d) Reddish colour

5 On heating a mixture of iron filings &sulphur powder strongly,the colour of the product becomes
a) Grey b) Black c) Brown d) Yellow

6 To prepare iron sulphide ,by heating a mixture of iron filings &sulphur powder ,we should use
a)copper dish
b) china dish
c) petri dish
d) china dish

7 The reaction of iron and sulphur to form iron sulphide takes place at:
a) at high temperature
b) in the presence of a catalyst
c) at moderate temperature
d) in the presence of an acid

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CBSE Class 9 Science Preparation Of Mixture And Compound Worksheet

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