Water (5)

Tuesday was World Water Day 2011 and the theme for this year was ‘Water for Cities’. The theme for this weeks blogs posts will therefore be all about water. So far, we have been focusing on the fact that water has a much higher boiling point than is predicted and that the reason could be pinned down to electronegativity.   Image kindly reproduced according to the licence at: http://en.wikipedia.org/wiki/File:3D_model_hydrogen_bonds_in_water.jpg You may also remember that yesterday I posted a question asking: ‘What causes electronegativity?’ Well, electronegativity is caused by ...

Colour Chemistry

We all love the beautiful solutions that transition metals produce but why do the produce such colours (or why do non transition metals not produce colours?) Well, it's all to do with the d-orbitals and electrons gaining and losing energy There are five d orbitals but they are not of equal energy - they are actually, ever so slightly split. Three d orbitals are slightly lower in energy than the other two. Now, an electron can gain energy and jump between these split ...