Transition metals and nanoparticles extra: GCSE Chemistry

Transition metal properties, catalysts, coloured compounds, nanoparticles and surface area to volume

The short version

Transition metals form ions with different charges, coloured compounds and catalysts. Nanoparticles have very high SA:V and special uses and risks.

Key idea

Grade 2–3: Transition metals live in the middle of the table. They are tougher than the Group 1 metals that fizz on water.

Grade 5–6: I can name Fe, Ni and Cu and say high melting point, hard, less reactive than Group 1.

Grade 9: I write a property-by-property contrast and I mention variable ion charge. I never call aluminium a transition metal just because it is a useful metal.

Go a bit deeper

Grade 2–3: Transition-metal stuff is often colourful. A catalyst helps the reaction but is still there afterwards.

Grade 5–6: I can name a coloured copper or iron compound and say ions can have different charges.

Grade 9: I pair Fe^2+ / Fe^3+ with colour and I define a catalyst without saying it is a reactant. I never call NaCl a typical coloured transition-metal compound.

Worked example

Lessons in this topic

1. Where transition metals sit
2. Coloured compounds and catalysts
3. Uses of transition metals
4. Nanoparticles
5. Uses and risks of nanoparticles

In the app each lesson is video (when we have a real YouTube id) then intro, learn and summary steps.

What the examiner wants

Recall typical transition metal properties, explain catalyst and colour uses, and calculate or discuss SA:V for nanoparticles.

Try these questions

Cover the answers and have a go first. Worked solutions are underneath.

Common mistakes

• Aluminium and zinc sit next to the block but are not treated as typical transition metals on this course. Do not dump Group 1 water-fizz stories as if they were Fe / Cu chemistry.
• A catalyst is not used up. Do not write that it is a reactant that gets remade later unless you are describing a mechanism AQA does not ask for. Colourless Group 1 salts are the contrast, not the exception that kills the rule.
• Do not swap the catalyst examples. Nickel is hydrogenation, not Haber. Iron is Haber, not household wiring. Copper is wiring, not the Haber catalyst.
• CO2 is not a nanoparticle. Nanoparticles are clusters of atoms in the 1-100 nm range, not individual small molecules.

Answers and working

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