How to make frosty patterns, which don’t melt at room temperature
In this experiment, “frosty” patterns appear before your eyes, even in a warm room! It’s an interesting home experiment you can do with the kids.
We recommend that you wear gloves during this experiment. If carbamide comes into contact with the skin or the mucous membranes, rinse it off with water. Carbamide is a safe compound.
Reagents and equipment:
- carbamide 300 g;
- water 50 ml;
Add 50 ml of hot water to the carbamide and mix thoroughly. Then apply the solution to the glass with the brush.
Carbamide is an organic compound that consists of diamide of carbonic acid. It has high solubility in water (around 50 g per 100 ml of water). When the temperature increases, the solubility of carbamide increases, and accordingly, in a small amount of hot water more carbamide dissolves. Thus a rich solution is created.
When this solution is applied to any surface, for example glass, water evaporates after a certain time, and crystallization of carbamide begins. The carbamide crystals spread over the glass, and cover it with beautiful needle-like patterns, resembling frost in winter. These patterns can easily be washed away with water.