Describe7 marksChallenge
A student adds concentrated hydrochloric acid to an aqueous solution of cobalt(II) chloride. The solution changes from pink to blue. Describe, in terms of d orbital splitting, why this colour change occurs.
CAIE A Level Chemistry 9701 · Chemistry of transition elements
Chemistry of transition elements: describe question
How this question is marked
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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