Variable Oxidation States & Roman Numerals
Cambridge IGCSE Chemistry 0620 · Transition Metals · Supplement Level
The Concept
State one chemical property of transition elements regarding their ions.
Define the term 'oxidation number' (oxidation state) in the context of transition metal ions.
Why are Roman numerals used in the names of many transition metal compounds?
Give TWO examples of transition metals that commonly exhibit variable oxidation states.
Explain why variable oxidation states are characteristic of transition metals but NOT of metals in Group I or Group II.
Iron Specifics
Give the formulae of the TWO common ions formed by iron.
What does the '(III)' indicate in the name Iron(III) chloride?
State the colour of an aqueous solution of Iron(II) sulfate.
State the colour of an aqueous solution of Iron(III) chloride.
Write the formula of (a) Iron(II) oxide and (b) Iron(III) oxide.
Comparisons
Explain why sodium compounds do NOT need Roman numerals in their names.
Compare the naming of Copper(II) sulfate and Sodium sulfate. Explain why one uses a Roman numeral and the other does not.
Calcium chloride does not use a Roman numeral in its name. State the reason for this.
A student writes the formula FeCl₂ and names it 'iron chloride'. Explain why this name is incomplete and write the correct IUPAC name.
Identify the oxidation state of the metal in each of the following compounds and explain how you determined it: (a) CuO (b) Cu₂O (c) MnO₂
Sign In to Keep Going
You've reached the end of the free preview. Sign in — and upgrade to Plus or Pro — to keep going with Chemistry.
Full Access
Unlock all 320 lessons