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The detergent coats the fat in the milk making it into globules called



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The detergent coats the fat in the milk making it into globules called micelles. As the globules form the watery part of the milk swirls and the red, yellow and blue colours are mixed together.

What is the important thing in this experiment – the milk or the detergent? Get them to repeat the experiment with no detergent, with water rather than milk, with skim milk and with cream. Which works best?

What do they think will happen if they used vinegar instead of detergent?
3. Capillary action

Cut out a flower from the template. You can get your students to colour it in if you like. Fold the flower so the petals cover up the smiley face. Put some water into a Petri dish and ask the students to predict what will happen when they put the folded up flower on top of the water. Now get them to float the folded flower on the water and watch what happens, get them to record this in their notebook or on a worksheet. Ask your students what they think has happened. For example you can get them to see if the paper is wet (does the dry flower unfold by itself).



The water molecules interact with the fibres in the paper, being pulled into the fibres by capillary action. As paper unfolds as the fibres swell with water.
Capillary action is how plants pull water from the ground up into their leaves.
Demonstration:

Take a white carnation or a stick of celery with leaves attached. Carefully split the stem into two halves, placing one half in a cup with water and red food colouring, the other half into a cup with water and blue food colouring. It will take a couple of hours (maybe longer) for the red and blue food colouring to make it to the flower or the celery leaves.





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