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    PPT-9C 7

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    Sneham Palangdar
    This document discusses different types of mixtures including true solutions, colloids, and suspensions. It defines each type based on the size of particles in the mixture and provides examples. Key points covered include: - True solutions have particle sizes less than 1 nm and appear homogeneous. Examples given are tea and sugar solutions. - Colloids have particle sizes between 1-1000 nm, appear homogeneous but are heterogeneous. Examples given are milk, blood, and shampoo. - Suspensions have particle sizes greater than 1000 nm, appear and are heterogeneous. Settling can occur. Characteristics and differences between the three types are also outlined.

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    PPT-9C 7

    Uploaded by

    Sneham Palangdar
    26 views17 pages
    This document discusses different types of mixtures including true solutions, colloids, and suspensions. It defines each type based on the size of particles in the mixture and provides examples. Key points covered include: - True solutions have particle sizes less than 1 nm and appear homogeneous. Examples given are tea and sugar solutions. - Colloids have particle sizes between 1-1000 nm, appear homogeneous but are heterogeneous. Examples given are milk, blood, and shampoo. - Suspensions have particle sizes greater than 1000 nm, appear and are heterogeneous. Settling can occur. Characteristics and differences between the three types are also outlined.

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    Chemistry book ch - matter around us class 9 free pdf

    Original Title

    PPT-9C+7

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    This document discusses different types of mixtures including true solutions, colloids, and suspensions. It defines each type based on the size of particles in the mixture and provides examples. Key points covered include: - True solutions have particle sizes less than 1 nm and appear homogeneous. Examples given are tea and sugar solutions. - Colloids have particle sizes between 1-1000 nm, appear homogeneous but are heterogeneous. Examples given are milk, blood, and shampoo. - Suspensions have particle sizes greater than 1000 nm, appear and are heterogeneous. Settling can occur. Characteristics and differences between the three types are also outlined.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    26 views17 pages

    PPT-9C 7

    Uploaded by

    Sneham Palangdar
    This document discusses different types of mixtures including true solutions, colloids, and suspensions. It defines each type based on the size of particles in the mixture and provides examples. Key points covered include: - True solutions have particle sizes less than 1 nm and appear homogeneous. Examples given are tea and sugar solutions. - Colloids have particle sizes between 1-1000 nm, appear homogeneous but are heterogeneous. Examples given are milk, blood, and shampoo. - Suspensions have particle sizes greater than 1000 nm, appear and are heterogeneous. Settling can occur. Characteristics and differences between the three types are also outlined.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 17

    Chapter-2:

    Is Matter Around Us Pure

    Topics To be covered:
    1.Concentration Terms
    (i) Mass by mass percentage
    (ii) Mass by volume percentage
    (iii) Volume by volume percentage
    True Solutions
    2.Classification of solutions Colloids
    Suspensions
    Mass by Mass Percentage(m/m%)
    Mass by Volume Percentage(m/v%)
    Volume by Volume Percentage(v/v%)

    Volume of solute
    Volume of
    C solution

    .
    X = (40/1000)L = 0.04Litres
    True Solutions
     The homogeneous mixtures in which the size of solute
    particles in a solution is less than or approximately
    equal to 1 nanometer are called true solutions.
    They are so small that they cannot be seen with the help
    of a simple microscope.
     The different constituents of the mixture can not be
    separated by any of the physical methods like filtration,
    settling or centrifugation.
    They are very stable which means, if left undisturbed
    solute particles do not settle down.
     They do not show tyndall effect.
     Some common examples are: filtered tea, brine
    solution, cold drinks, sugar solution, etc.
    Colloids
    The heterogeneous mixtures in which the size of
    solute particles in a solution is in between 1-1000
    nanometer are called colloidal solution.
    They are heterogeneous in nature but appear to be
    homogeneous.
    The solute in colloids is called dispersed phase and
    the solvent in colloids is called dispersion medium.
    Colloidal solutions can pass through ordinary filter
    paper but not through ultra fine filter paper.
    The components of the colloids can be separated by
    centifugation method.
    To know the difference between
    True solutions, Colloids and Suspensions
    They are transluscent in nature.
    They show tyndall effect, i.e., when a beam of light is
    passed through the colloidal solution then its path
    becomes visible, due to scattering of light by colloidal
    particles.
    They show brownian motion, i.e., the particles of
    colloid show zig-zag motion.
    They show coagulation, i.e., when some chemicals are
    added to them, their colloidal nature gets destroyed and
    particles aggregate to form bigger particles and then
    settle down at the bottom.
    They diffuse slowly as compared to true solutions.
    Some common examples are: Milk, Blood, Shampoo,
    Smoke, Butter, Cheese, Hair cream, Froth, Gem
    stones, Pumice stone, etc.
    Types of Colloidal Systems

    Foam
    Suspensions
    The heterogeneous mixtures in which the size of
    solute particles in a solution is more than 1000
    nanometer are called suspensions.
    They are heterogeneous in nature.
    They are unstable, that means if left undisturbed the
    solute particles get settled down at the bottom.
    The solute particles can be seen easily with naked eyes.
    Suspensions cannot pass through ordinary filter paper,
    therefore they can be filtered by filter paper.
    The suspensions are opaque in nature.
    The suspensions can scatter the light passing though
    them.
    Characteristics of True solutions,
    Colloidal solutions and Suspensions
    Home Work
    1.Give reasons:
    (a)Sky appears blue in colour.
    (b)Blood can be stopped by applying the alum
    solution, when there is a cut.
    (c)Suspension is heterogeneous in nature.
    2.What is the basis for the classification of mixtures
    into true solutions, colloids and suspensions?
    3.Give an example of :
    (a)Water in oil emulsion
    (b)Oil in water emulsion
    4.Give one method to separate the components of the
    colloids.
    5.Can you convert milk(a colloidal solution) into a
    suspension. If yes, then how?
    6.How much water will be required to prepare 20%
    aqueous salt solution by adding 10g of common salt?
    7.Calculate the volume by volume percentage of a
    solution of 15mL of ethyl alcohol in 60mL of gasoline.
    8.Identify the dispersed phase and dispersion medium
    in (a) Smoke (b)Fog (c)Soap lather (d)Blood plasma.
    9.Smoke and Fog both are aerosols. In what way are
    they different?
    10.What is the difference between a solid solution and
    a solid sol? Explain with an example.
    11.Gases do not form a colloidal solution. Comment.

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