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Transition metals (A-level only)
This A-level-only topic develops d-block chemistry through complex ions and variable oxidation states.
13
Objectives
10
Flashcards
10
Questions
90 min
Study time
AqaA LevelChemistryInorganic chemistry
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What you need to know
13 objective pages available
Transition-metal characteristics (A-level only)4 objectives
- Define a transition metal as a d-block element forming at least one ion with an incomplete d subshell.
- Explain variable oxidation states in transition metals.
- Explain why transition-metal ions are often coloured.
- Explain catalytic activity of transition metals and their compounds.
Complex ions and ligand substitution (A-level only)5 objectives
- Define ligand and coordinate bond.
- Explain coordination number in complex ions.
- Describe octahedral, tetrahedral and square planar complexes.
- Explain ligand substitution reactions.
- Use equations to represent ligand substitution.
Isomerism and redox in transition-metal chemistry (A-level only)4 objectives
- Identify cis-trans and optical isomerism in complex ions.
- Explain redox changes involving transition-metal ions.
- Use transition-metal redox titration data in calculations.
- Interpret colour changes in transition-metal reactions.
Key terms
LigandCoordination numberOxidation stated-d transitionCatalystCoordinate bondCoordination NumberCoordination complexComplex ionLigand substitutionTetrahedral complex
Exam tips
- Use clear and precise language in definitions: When defining transition metals, ensure you mention the incomplete d subshell to avoid ambiguity.
- Show your working in calculations: Always show your calculations step-by-step, including the formula used and the final answer with units.
Common mistakes
- Confusing transition metals with main group elements: Remember that transition metals are defined by their ability to form ions with incomplete d subshells, while main group elements do not have this characteristic.
- Confusing oxidation states with charges: Remember that oxidation states refer to individual elements, while the charge refers to the entire compound.
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