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Grow your own crystal rock candy! This experiment is adapted from the one by Anne Marie Helmenstine, found at About.com. Materials: A cup of water 3 cups of sugar A clean glass jar, like a mayonna...
Turn regular milk into a magical piece of art!
This experiment is adapted from the one by Anne Marie Helmenstine, found at About.com.
What's going to happen: (Spoiler
alert!) The food colouring will start to swirl and move in
different directions, and the once-white milk will become a
magnificent, colourful artwork.Cool
You can watch a video of the experiment right here!
The chemistry behind the scenes:
Milk is a homogeneous mixture of many chemical substances,
elements and compounds. Among these you will find proteins, which
are natural compounds found in food and in your body, fats, which
are also found in food and in the body and are generally soluble in
organic compounds but not in water, calcium (Ca, element #20), and
other cool milky stuff.
Dish detergents are chemicals designed specifically to clean your plate of food. They contain phosphates, which are compounds that have phosphorus and can dissolve calcium, and various enzymes that break down proteins and fats to smaller particles that can be easily washed away with water. Detergents also contain chemicals called surfactants, which lower the surface tension of a liquid and allow easier spreading.
When we add food colouring to the milk, nothing
happens. BUT, when the dish detergent
touches the milk, things start to move. The surfactants reduce
surface tension, which allows the food colouring to spread around
the milk. Then the enzymes start to react with the calcium,
proteins and fats in the milk, which causes the colour pigments
from the food colouring to get pushed around, resulting in a cool
So you see, it's not magic. It's chemistry!
Chemistry is cool!