This is a blog of the 4th grade class in la Farigola de Vallcarca School in Barcelona. This year we are doing “Aula de Ciències” in English.
In this blog we want to show you the experiments we do in our Science Lab. Science is fun!

dijous, 4 de març de 2010

Paper chromatography

MATERIALS Paper towel Red, yellow and blue food colouring 1 glass Spoon Water Scissors An eye-dropper Water INSTRUCTIONS Drop one drop of red, one drop of yellow, and one drop of blue food colouring together on a glass. Mix the three drops together and observe the mixture. Cut a 3 cm strip of paper towel. Using the eye-dropper put a small drop of the food colour mixture in the centre of the paper towel strip about 3 cm from one end. Fill the other glass with water. Place the end of the paper towel strip with the food colouring dot into the water. Make sure the water does not touch the food colouring. Observe for 5-10 minutes. The water separates the food colouring mixture with separate portions of red, blue and yellow on the paper towel strip. WHY? Because the water creeps along the surface of the paper and dissolves the particles of colour. The components of the mixture move along the paper. The different colours do not move at the same speed because they all have different attractions to solvent and paper. WHAT DO YOU THINK ABOUT IT? WRITE YOUR OPINIONS!

11 comentaris:

  1. When the food colouring touches the water the food colouring expands and forms many colours.

    Anna and Inés

  2. This experiment is very funny the colours are very beautiful.


  3. Hello!!!!This experiment is very funny!!!
    It's paper of food colouring(red,yellow,blue and green)
    Good bye!!!!!!!!

    Paula L and Marina

  4. Hello I'm Oriol. This experiment is very funny.

  5. This experiment is very funny!!!!!!!!!!!!!!!!!
    I like it a lot.


  6. This experiment is very beautiful.I like mixing
    food couloring and water.It's funny !!!!!!!!!!!!
    Laia and Vera

  7. This experiment is very beautiful and scientific.The water saparates the colours. We like when the colours expand.

    Belén and Lluc

  8. Josecarlos and Carlos18 de març de 2010 a les 9:00

    This esperiment is cool because the food couloring separates and forms one picture.

    josecarlos and carlos

  9. Hello Marta the experiment is very funny.
    I like this experiment of the papertowel and
    the food coloring ,good bye class!!!!!!!

    Paula.v. AND IRINA

  10. This experiment is for scientists because in murders blood separates.

    Marc and Roger

  11. Hello,
    my mother has bought food colouring so that my brother and I can do the experiments at home.
    Happy Easter holidays!!!!!