The document summarizes an experiment investigating the reaction between different types of milk (full cream milk and skim milk) and dish soap. When a drop of soap is added to milk containing food coloring, the coloring moves towards the edges of the plate as the soap spreads and "grabs" the coloring. This is because the chemicals in soap weaken the bonds in milk by attaching to fat molecules, causing the coloring to move away from where the soap touched. With full cream milk containing more fat, the reaction and movement of coloring is greater, while little reaction occurs with low-fat skim milk lacking fat for the soap to interact with.

1. AIM: To Investigate reaction of different types of milk to dish soap
HYPOTHESIS: Soap and Milk will combine to form a mixture .
APPARATUS: Plate, Full cream Milk, Skim Milk, different colours of food colouring, liquid
Soap and cotton wool buds
METHOD:
 Pour milk to cover the bottom of the plate.
 Drop a small amount of each different colour of food colouring in the milk in the
centre of the plate
 Then put a drop of liquid soap in the middle of the plate of milk. You can use a
cotton wool bud for this as well.
 Take a cotton wool bud and skimthe surface of the milk. Do not mix or stir the milk
just touch it with the tip of the bud
RESULTS AND DISCUSSION:
 Dish soap and milk do not mix. The soap stays on top of the milk
 Food colouring also floats on top of milk and does not mix with the milk
 The food colouring moves towards the edge of the plate as soon as the soap touches
the milk , making a beautiful pattern as it moves
 As the soap spreads, it “grabs” the food colouring and “attacks” the fat in the milk
which causes the swirling of the colours.
 This happens because the chemicals in soap weaken the bonds in milk by attaching
to the fat molecules of milk
 The food colouring will move away from the point where the soap touched the milk.
 This interaction between the soap and fat causes movement as the soap breaks
down the fat in the milk.
 By using a different milk product ( Skim Milk ) you will notice that because there is
not as much fat in the milk the reaction is smaller
CONCLUSION:
 The food colouring on the plate with full cream milk will move the fastest because
there are more fat molecules.
 In the bowl with the skimmilk there is virtually no reaction as there are not fat
molecules for the soap to hold on to.
 Soap and milk do not combine to form a mixture