Color
Changing Milk
★Time: takes around 5 minutes
★Cost: around $5~6
★Materials:
- Milk (whole)
- Dinner plate
- Food coloring (red, yellow,
green, blue)
- Dish-washing soap (Dawn brand
works well)
- Cotton swabs
★Area of Topic : Chemistry
★Learning Objectives:
Students can learn about chemical reaction.
★ Procedure
1. Pour some milk in the dinner
plate.
2. After pouring some milk, add one
drop of each of the four colors of food coloring in the center- red, yellow,
blue, and green.
3. Put drop of liquid dish soap on
the tip of the cotton swab.
4 And touch the surface of the milk
(in the middle) with the cotton swab and hold it there for 10 seconds and see
what it happens.
★Explanation:
How does it work?
Milk is mostly water but it also
contains vitamins, minerals, proteins, and tiny droplets of fat suspended in
solution. As fats and proteins are sensitive to changes in the surrounding
solution when it adds the soap, it weakens chemical bonds that hold the proteins
in solution are altered. Therefore, the food color molecules are bumped and
shoved everywhere.
There's another reason the colors
explode the way they do.
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