Wednesday, 13 February 2013

1.4 describe and explain experiments to investigate the small size of particles and their movement including: i dilution of coloured solutions ii diffusion experiments

Dilution: a substance is put in a solvent to reduce its concentration
Diffusion: The movement of particles from an area of high concentration to an area of low concentration

Experiment 1, Diffusion
Hydrochloric acid is placed at one end of a tube, ammonia solution at the other.
Where they meet a ring of ammonium chloride appears.
The diagram shows it is closer to the HCL end.
From this we can tell that ammonia must have travelled faster, as it got further in the time. Lighter particles travel faster- so we can tell that ammonia is a lighter gas.




Experiment 2, Dilution
Put a coloured substance in a solvent e.g food colouring in water.
You can see that over time the colour levels out but is weaker than the original colour- this is dilution.
Dilution at different temperatures: more heat; means more energy; means more movement; so the particles can move to different areas more quickly. So applying heat decreases the amount of time taken for the coloured substance to be fully diluted.
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17 comments:

  1. Unknown19 May 2013 at 02:41

    Thank for the Blog its really helping me out

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    Replies
    1. aliceinwonderland1525 July 2013 at 05:21

      http://www.rsc.org/learn-chemistry/wiki/TeacherExpt:Diffusion_of_gases_-_ammonia_and_hydrogen_chloride it actually forms near the hydrochloric acid side.

      Delete
    2. HannahHelp25 August 2013 at 03:12

      Thank you very much! let me change that ;P

      Delete
  2. Anonymous27 May 2013 at 11:31

    Hannah, have you got any other Revision Blogs for any other subjects and have you finished your IGCSEs?

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    Replies
    1. HannahHelp28 May 2013 at 06:59

      I just have this blog and one for physics (hannahhelpphysics.blogspot.co.uk)and one for biology(hannahhelpbiology.blogspot.co.uk). I haven't finished yet, I am currently doing the exams: I have done all the paper 1s and in two weeks I will have done the paper 2s aswell!

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    2. Dustman14 June 2013 at 10:01

      Thanks for this! Really useful

      Delete
  3. aliceinwonderland1525 July 2013 at 04:54

    Hannah, maybe you could do a site with GCSE exam tips (in particular for the sciences)? it would be really useful since you experienced them first-hand:)

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  4. Nathaniel26 August 2014 at 06:53

    This comment has been removed by the author.

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  5. Anonymous31 March 2015 at 22:42

    "it is closer to the ammonia solution... that ammonia must have travelled faster". Not sure if that's correct, but I may be wrong.

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  6. Unknown14 April 2015 at 10:19

    If the ammonia particles travel faster then the ring should form closer to the hyrdrochloric acid.

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  7. Unknown6 December 2015 at 23:40

    Hannah,can you help me to solve this chemistry question?
    what is relationship between diffusion and space between particles?

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  8. Unknown19 January 2016 at 04:15

    Really useful resource thanks

    ReplyDelete
  9. Unknown5 September 2016 at 07:27

    I luv myself

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  10. Bibblemeizzy29 November 2016 at 14:26

    Thank you so much! Can't tell you how much this has helped me xx

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  11. Anonymous8 April 2017 at 07:02

    for the diffusion experiment, wouldn't it be hydrogen chloride gas rather than hydrochloric acid, as it is talking about diffusion?

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