F325 OCR A2 Chemistry - Transition Elements Electronic Confiqurations, Properties, Colours, Catalysis and Precipitation. 3.5 / 5 based on 6 ratings ? ChemistryTransition metalsA2/A-levelAll boards Created by: MariaCreated on: 12-05-12 16:46 Define a transition element? it is a d-block element that forms an ion with an incomplete d sub-shell 1 of 10 What block on the periodic table do the transition elements reside? d-block 2 of 10 Does the 4s sub-shell have a lower energy than the 3d sub-shell? Yes 3 of 10 On the periodic table there are two elements that have 1 electron in the 4s sub-shell, what are they? Copper and Chromium 4 of 10 Transition elements first lose electrons from? 4s sub-shell 5 of 10 How many different oxidation states does Manganese have? 7 6 of 10 The highest oxidation state of a transition element is often found in a strong oxidising agent? True 7 of 10 Precipitation - what colour change would you observe when NaOH is added to Fe +2 ions? pale green solution which forms a green precipitate turning rusty brown on surface when standing in air 8 of 10 Cobalt +2 ions are what colour pink 9 of 10 When cobalt +2 ions react with NaOH, what is the result? A blue precipitate which turns beige in presence of air 10 of 10
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