Thursday, August 6, 2015

Colour Changing Milk

             Colour Changing Milk by Ethan

We want to find out…
How will different types of milk react to dish washing liquid?
I think it will mix when you put dish washing liquid because I was doing the dishes and a plate had colour and when I put wash liquid in it, it blasted.
What we need
  • 2 Dinner plates
  • Whole Milk
  • Trim Milk
  • Sticky Labels
  • Food colouring (Red, Yellow, Blue, Green)
  • Dish washing liquid
  • Cotton Buds
What we will do
  1. Label the two different plates, one as standard, one as Trim
  2. Pour milk onto each plate so the bottom is completely covered. Allow the milk to settle.
  3. Gently squeeze a tiny drop of each food colouring into the middle of the plate. Make sure the drops are close together.
  4. Touch the tip of a cotton bud into the center of the colours. What happened?
  5. Put some dish washing liquid on the other end of the cotton bud.
  6. Place the soapy end into the middle of the milk and hold it there for 10 to 15 seconds. Look what happens!
  7. Add another drop of soap to the tip and try it again and at different places in the milk.
When the cotton bud with the dish washing liquid touched the milk, the colours moved away quickly and then swirled around and mixed together.
The whole milk worked faster than the trim milk. It moved away but it didn’t seem to swirl as much.
What we found out
That soap gets rid of fat.The trim milk has less fat than the whole milk.
Science Idea
What is the scientific thinking?
The milk has fat in it and soap grabs on to it and it tries to get rid of the fat then it blasts around the milk in the plate.
The dish soap does not mix with the milk. Instead it floats on top and spreads over the surface. As it spreads, it grabs the food colouring. Soap is a "egreaser" so the molecules in it are attacking the fat in the milk, causing motion which creates the swirling of the colours.

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