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Although it can seem a unusual question it simply requires to have understood the basis of a titration.

First of all, what is a pH indicator? It is simply an acid-base compound whose acid...

(i) In general, when a molecule absorbs a UV-visible photon, an electron is promoted from one of the occupied molecular orbitals to an unoccupied molecular orbital at higher energy.

(ii) ...

I would first get the student to find the elements on the Periodic Table, and work out how many valence electrons each atom had. Then I would get them to draw the structures of hydrogen and chlorine us...

Elements in the group one (i.e. alkali metals from lithium to francium) exhibit metallic bonding: the positive nuclei are held together thanks to the attraction to delocalised electrons. As the number ...

A species with one or more valence electron pairs that forms co-ordinate bonds with a metal ion.