Amarchand Singhvi International School 6... · 1.Homogeneous Mixture: It is a mixture that has...

Amarchand SinghviInternational School

Subject : Science

Class : VI

Chapter : Separation of Substances (Part-1)

Topic : Mixture and its types,

Separation methods

Teacher : Ms. Vaishali Parmar

E-Learning Programme

What is mixture?

Amarchand Singhvi International School

➢ For example,

▪ Tea

▪ Air

➢ Mixture is a substance that contains two or morepure substances mixed together in varyingproportions.

➢ A mixture can be a solid, liquid or gas.

➢ The pure substances that present in the mixture arecalled components.

Types of Mixture


1.Homogeneous Mixture:

▪ It is a mixture that has uniformly distributedcomponents.

▪ For example, mixture of salt and water.

2.Heterogeneous Mixture:

▪ It is a mixture that does not have uniformlydistributed components.

▪ For example, chalk in water.

Need for separation of substances in a Mixture


▪ To remove harmful substances.

▪ To obtain useful components.

▪ To remove undesirable substances

Methods of Separation


1.Hand-picking:

▪ Hand-picking means to take outby hand.

▪ This method is generally used toseparate undesirable substances..

▪ Hand-picking method can be used when.

o The shape, size or colour of the unwantedsubstance is different from the of the useful one.

o The quantity of the mixture is small.

o The impurity is present in small quantity.


2. Threshing:

▪ The process of separating grains from the stalk bybeating them on the ground or by a machine iscalled threshing.

▪ After harvesting the food crops, the grains areseparated by threshing .

Manual Threshing Threshing by machine


3. Winnowing:

▪ The process of separating heavier and lightercomponents of a mixture by wind or blowing air iscalled winnowing.

▪ For example, Mixture of grain and husk.


4. Sieving:

▪ The method of separatingthe components of a mixturethat are of different sizes byusing a sieve is called sieving.

▪ A sieve is a shallow vesselthat has small holes.

▪ This method is used inhomes to separate wheatbran from flour.

▪ A sieve is also used toseparate stones and pebblesfrom the sand.

Separation of Insoluble solids from a liquid


1. Sedimentation and Decantation:

▪ Insoluble substances that are heavier than liquid canbe separated by sedimentation and decantation.

▪ The process of settling down of heavier insolubleparticles at the bottom of a liquid is calledsedimentation.


▪ The process of pouring out a clear liquid from avessel after sedimentation, without disturbing thesediment- heavy, insoluble settled particles, is calleddecantation.

▪ When rice and pulses are washed with waterbeforecooking, then the water is separated from them bydecantation.


2. Loading:

▪ The process of increasingthe rate of sedimentationin a suspension, by addingsome chemicals to it, iscalled loading.

▪ Loading is done by using apiece of alum.

▪ Alum is soluble in water.

▪ Loading helps thesuspended clay particles tosettle down rapidly.


3. Filtration:

▪ The process m a liquid,using a filter paper orcloth, is called filtration.

▪ The mixture is pouredinto a filter paper conefixed in a funnel .

▪ The liquid passes through the filter paper andcollects in the beaker kept below the funnel.

▪ The solid particles left behind on the filter paper iscalled residue.

▪ The clear liquid obtained is called filtrate.


Uses in everyday life:

▪ The used tea-leaves areseparated from preparedtea by filtration method.

▪ Fruits and vegetable juicesare usually filtered beforedrinking.

▪ The paneer is separatedfrom the liquid through afine filtering cloth or astrainer.

▪ The cream can beremoved by this method.

Note: This presentation is a part of the E-Learning Program of Amarchand

Singhvi International School and is created only for educational purpose.

Compilation & presentation : Ms. Vaishali Parmar

Web support & management : Mr. Deepak Chellani

Technical support : Mr. Shivam Gundecha

E-learning Program Co-ordination:

Mr. Prashant Chaturvedi

Produced by

Mr. Mridul Varma (Principal)Amarchand Singhvi International School

Parekh Parisar, Ward 7A, Gandhidham – Kutch

Gujarat 370201 India

Amarchand Singhvi International School 6... · 1.Homogeneous Mixture: It is a mixture that has...

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