This topic summary covers Knowledge Organiser: Transition Metals within Transition Metals (HT) for GCSE Chemistry. Revise Transition Metals (HT) in Atomic Structure for GCSE Chemistry with 20 exam-style questions and 21 flashcards. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 12 of 12 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Knowledge Organiser: Transition Metals
Key Terms
- Transition metals: Central block, centre of periodic table
- Catalyst: Speeds up reaction, not used up
- Variable charge: e.g., Fe²⁺ or Fe³⁺
- Alloy: Metal mixed with other elements
Must-Know Facts
- Hard, dense, high melting point, less reactive than Group 1
- Form coloured compounds: Cu = blue, Fe²⁺ = green, Fe³⁺ = orange-brown
- Can form variable ions (e.g., Fe²⁺ and Fe³⁺)
- Iron: catalyst in Haber process (ammonia)
- Nickel: catalyst for hydrogenation (margarine)
- Platinum: catalyst in catalytic converters
- Alloys harder than pure metals — different-sized atoms disrupt regular layers
- Steel (Fe + C), brass (Cu + Zn), bronze (Cu + Sn)
Key Equations
- No specific equations — transition metals act as catalysts (unchanged in reactions)
- Fe²⁺ + 2OH⁻ → Fe(OH)₂ (green precipitate with NaOH)
- Fe³⁺ + 3OH⁻ → Fe(OH)₃ (orange-brown precipitate with NaOH)
- Cu²⁺ + 2OH⁻ → Cu(OH)₂ (blue precipitate with NaOH)
Common Mistakes
- Saying transition metals are in Groups 1–7: They occupy the central d-block — not the main group columns
- Confusing Fe²⁺ and Fe³⁺ precipitate colours: Fe²⁺ = green; Fe³⁺ = orange-brown — learn both
- Saying catalysts are used up: Catalysts speed up reactions but are not consumed — they remain unchanged
- Forgetting transition metals have variable oxidation states: Iron can be Fe²⁺ or Fe³⁺ — must state which ion in answers
Practice questions for Transition Metals (HT)
Where in the periodic table are the transition metals located?
Explain why copper is a useful metal for electrical wiring.
Quick recall flashcards
Name 3 transition metals
Iron, Copper, Nickel (also Zinc, Gold, Silver, Platinum)
What is a catalyst?
A substance that speeds up a reaction without being used up