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Home » Class 9 » Is matter around us pure » Colloids

Colloids

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

Question 1 What are colloids. Give example?

Question 2 What do you mean by Tyndall effect?

Question 3 Give properties of colloids?

Question 4 What are sol.Give example?

Question 5 What are aerosol.Give example?

Question 6 What are emulsions.Give example?

Question 7 What are foam.Give example?

Question 8 What is the difference between solution and colloids?

Contents

  • 1 Colloids
  • 2 Properties of Colloids
  • 3 Types of Colloids 

Colloids

A solution in which the size of solute particles is intermediate between those in true solution and suspension is called as Colloids.

For Example: Soap Solution,Starch solution,milk,Blood,ink etc.

Properties of Colloids

1) They appear to be homogeneous but actually they are heterogeneous when observed under microscope.

2) They are not perfectly transparent,it is somewhat translucent.

3) The particles cannot be seen by naked eyes or microscope.

4) The particles do not settle on keeping.

5) The particles cannot be separated by filtration.

6) The particles are big enough to scatter light.

7) The size of particles is bigger than those of true solution but smaller than suspension.

If a beam of light is put on a colloidal solution,kept in a beaker in a dark room,path of light beam is illuminated and become visible when seen from the side.

The path of light beam becomes visible because colloidal particles are big enough to scatter light falling on them in all direction.

tyndall effect

The scattering of light by colloidal particles is called TYNDALL EFFECT.

A true solution does not scatter a beam of light passing through it but colloidal solution scatter a beam of light.

Types of Colloids 

Name of Colloid Dispersed Phase Dispersed Medium Example
1)    Sol Solid Liquid Ink, Soap Solution,Paints
2)    Solid Sol Solid Solid Coloured Gemstones
3)    Aerosol a)Solid

b)Liquid

Gas

Gas

Smoke,

Automobile exhaust

Fog,Mist,Cloud

4)    Emulsions Liquid Liquid Milk,Butter,

Cream

5)    Foam Gas Liquid Shaving Cream,Soap Bubbles
6)    Solid Foam Gas Solid Insulating Foam,Foam Rubber,sponge
7)    Gel Liquid Solid Jellies,Gelatin

 

Filed Under: Class 9, Is matter around us pure Tagged With: colloids, dispersed medium, dispersed phase, properties of colloids, tyndall effect, types of colloids

About Mrs Shilpi Nagpal

Author of this website, Mrs. Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed. (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading free education to everyone.

Reader Interactions

Comments

  1. Seema says

    August 5, 2020 at 7:56 am

    This is very helpful for us ,now I understand my all doubts is clear.

    THANKYOU

  2. Moosa Rahaman says

    August 13, 2020 at 12:33 pm

    VERY HELPFUL!! THANKYOU SO SO MUCH!!

  3. bhuvn says

    August 19, 2020 at 4:37 pm

    nice and cool explaination

  4. Chaithra. K.S says

    September 3, 2020 at 4:32 pm

    Mam THANK YOU soo much.
    You helped me in writing class work.
    Once again THANK YOU mam.

  5. Shraddha says

    September 9, 2020 at 6:39 am

    That definition is very helpful for me so, thanks man thank you so much

  6. Kavya rajawat says

    March 12, 2021 at 9:34 pm

    Very nice and easy answers

  7. Anandi Sharma says

    July 1, 2021 at 2:41 pm

    yes it was really helpful, keep up the good work

  8. Manthan says

    July 28, 2021 at 5:33 pm

    Thanks for the notes and you all are doing great job by uploading notes very helpful

  9. Srikanthimathy says

    September 11, 2021 at 10:54 am

    Thanks for helping me to complete my project this helped me a lot.

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