Notes on Centrifugation and Chromatography | Grade 8 > Science > Mixture | KULLABS.COM

Centrifugation and Chromatography

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Centrifugation

Centrifugation is a method in which solid or liquid particles of different densities are separated by rotating them in the tube in a horizontal circle. The heavier suspended particles move down and lighter particles remain on top. In this method, the mixture is rotated at a high speed in a test tube in a machine called centrifuge.

Chromatography

Chromatography is a technique of separating the constituents of a mixture of liquids. It is also used for gases. These substances should be such that they do not go undergo a chemical reaction with each other. The substances on which the mixtures are absorbed are called absorbents. Some of them are silica gel, filter paper, cellulose powder, alumina, etc.

Paper chromatography

Paper chromatography proceeds by a mechanism which is partly partition and partly absorption. The solute mixture, generally dissolved in water, is placed on a strip chromatographic paper and a second solvent is allowed to travel along the strip. It will extra the solute as a result distribution of the solvent between the two solvents.

Application of Chromatography

This method of separation is used to separate various chemicals in chemistry. Moreover, it is used in following sectors:

  1. To separate different colours from the mixture.
  2. To identify the medicines used by a person with blood and urine.
  3. To identify the quality of a colour.



  • Centrifugation is a method in which solid or liquid particles of different densities are separated by rotating them in tube in a horizontal circle.
  • Chromatography is a technique of separating the constituents of a mixture of liquids. It is also used for gases.
  • Paper chromatography proceeds by a mechanism which is partly partition a partly absorption.
  • In chromatography reacting substance cannot take part.
.

Very Short Questions

The advantages of chromatography are:

  • It is used to separate colored substances present in natural pigments.
  • It is used to detect and identify drugs present in the blood.

No, because they are absorbed to a same extent and can’t be separated from each other.

Chromatography is a technique that is used for separation the component of a mixture by passing it through a column or sheet of an absorbing material.
Absorbent chromatography is based on the principle that "a certain absorbent can absorb different substances to different extents” When a solution containing two or more than two dissolved substances is to be separated, it is allowed to pour into a vertical glass tube packed with finely divided absorbent like alumina. The colors of dissolved substances in a solution are separated in the form of bands.

It is the process of separation very fine suspended solid particles or semi-solid from a mixture by rotating the mixture kept in a centrifuging machine at high speed.
It is done by rotating a machine at a high speed.


s.n
filtration chromatography
1 This method is used to remove an insoluble substance from a mixture by the use of filter paper is called filtration. Chromatography is the method of separation of colours / pigments from a solution
2 It can separate insoluble substance from the mixture. This process is used to separate colour of mixture.

The applications of chromatography are:

  • To separate different colours from the mixture.
  • To identify the medicines used by a person with blood and urine.
  • To identify the quality of a colour.

Paper chromatography proceeds by a mechanism which is partly partition aand partly absorption. The solute mixture, generally dissolved in water, is placed on a strip chromatographic paper and a second solvent is allowed to travel along the strip. It will extract the solute as a result distribution of the solvent between the two solvents.

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  • Centrifugation is defined as ______.

    process of separation of pure crystals from a solution


    method in which solid or liquid particles of different densities are separated by rotating them in tube in a horizontal circle.


    none of these


    a technique of separating the constituents of a mixture of liquids


  • Chromatography is used to separate the mixture of ______.

    liquid


    solid only


    both solid and liquid


    solid


  • The process of separation of pure crystals from a solution is called ______.

    crystallization


    chromatography


    centrifugation


    distillation


  • In which method of seperation of mixtures filter paper is not used?

    crystalization
    filtration
    chromatography
    sublimation
  • Which of them is the hardest crystal?

    saphire
    moonstone
    diamond
    ruby
  • Which one of these is not the method for separation of mixture?

    calligraphy
    crystallization
    centrifugation
    paper chromatography
  • ______________ is a method in which solid or liquid particles of different densities are separated by rotating them in the tube in a horizontal circle.

    paper chromatography
    calligraphy
    crystallization
    centrifugation
  • Which of these method uses the high speed moving electric motors?

    centrifugation
    crystallization
    paper chromatography
    calligraphy
  • Which of these method is used to separate cream from milk ?

    paper chromatography
    crystallization
    centrifugation
    calligraphy
  • Which of these methods woks on the principle of absorption or attraction of one substance in the other ?

    calligraphy
    centrifugation
    chromatography
    crystallization
  • Absorbents are:

    Substances that absorbs other.
    Substances that are left after evaporation.
    Substances that are left after absorption.
    Substances that gets absorbed in other.
  • Paper chromatography uses:

    paper that is partly partitioned and partly absorbs
    paper that is soluble in ether
    paper that is partly partitioned but non absorbent
    paper that is soluble in water
  • Crystals are:

    solid without regular periodic arrangement of structural unit such as atoms ions or molecules
    none of these are right
    formation of shapes from a substance that can be used to wear ornaments
    solid with regular periodic arrangement of structural unit such as atoms ions or molecules
  • Crystals can form:

    definite geometrical shapes
    only irregular shapes
    only regular shapes
    any of the shapes
  • Crystals formed by calcium carbonate are:

    alum.
    cubical.
    non symmetrical because it cannot form crystals.
    hexagonal.
  • The process of formation of crystals is called:

    crystal formation
    crystallification
    crystallization
    none of the answers are right
  • Which of the following is not the process of crystallization?

    filtration of the solution
    choice of solvent
    preparation of solution
    Solvent evaporation
  • A technique in which separation of vatious components is acieved by utilization of diffference in the degree to which various substances are attracted on to the surface of another substance is called

    centrifugation
    crystalization
    chromatography
    sublimation
  • Which one of the following is a technique in which a filter paper is taken as adsorbent material for analysing mixture by chromatography?

    Centrifugation
    Adsorption chromatography
    Gas liquid partition chromatography
    Paper chromatography
  • Chromatography means

    cartography
    colour writing
    colour printing
    calligraphy
  • Who discovered chromatography ?

    Mikhail Tswett
    Madam Curie
    John Dalton
    Louis Pasture
  • When was chromatography invented?

    12th century
    20th century
    21st century
    19th century
  • Which one of the following is based on the principle "A certain adsorbent can adsorb different substance to different extents"?

    Paper chromatography
    Gas liquid partition chromatography
    Centrifugation
    Adsorption chromatography
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ASK ANY QUESTION ON Centrifugation and Chromatography


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Forum Time Replies Report
Cxfg

Crystal


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biplop swornakar

urine and blood is seprated by this process


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What type of mixtures are separated by chromatography


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Saishma

Hey! It is a technique in which a filter paper is taken as an adsorbent material for analyzing mixtures


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