RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Urea-methanal polymerisation. Methanal solution is added to a beaker containing urea (white) and stirred. Drops of sulphuric acid are added to the beaker and the solution turns opaque before a hard white solid is formed. This is condensation polymerisation reaction in which water is eliminated as urea and methanal molecules combine.
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