What are the common uses of metals in everyday life according to the Cambridge IGCSE Chemistry syllabus?

Metals are used in a variety of applications due to their unique properties. For example, iron is used in construction for its strength and durability, aluminum is used in packaging and transportation due to its lightweight nature, and copper is used in electrical wiring because of its excellent conductivity. These uses are highlighted in the Cambridge IGCSE Chemistry syllabus as key examples of how metals are integral to modern life.

Why is copper preferred for electrical wiring in the context of Cambridge IGCSE Chemistry?

Copper is preferred for electrical wiring because it has excellent electrical conductivity, which means it allows electricity to flow through it easily. Additionally, copper is ductile, meaning it can be drawn into thin wires without breaking. These properties make copper an ideal choice for electrical applications, a point emphasized in the Cambridge IGCSE Chemistry curriculum.

How does the Cambridge IGCSE Chemistry syllabus explain the use of metals in construction?

The Cambridge IGCSE Chemistry syllabus explains that metals like iron and steel are extensively used in construction due to their strength and ability to withstand heavy loads. Steel, an alloy of iron, is particularly valued for its tensile strength and is used in building frameworks, bridges, and other structures. This use of metals in construction is a key topic in the study of metals in chemistry.

What role do metals play in the transportation industry as per the Cambridge IGCSE Chemistry curriculum?

Metals such as aluminum and steel play crucial roles in the transportation industry. Aluminum is used in the manufacturing of aircraft and vehicles because it is lightweight yet strong, which improves fuel efficiency. Steel is used in the construction of ships and trains due to its durability and strength. The Cambridge IGCSE Chemistry curriculum highlights these applications to illustrate the importance of metals in transportation.

Can you explain the use of metals in the medical field according to the Cambridge IGCSE Chemistry syllabus?

Metals are used in the medical field for various purposes, as outlined in the Cambridge IGCSE Chemistry syllabus. For instance, titanium is used in surgical implants and prosthetics due to its biocompatibility and strength. Silver is used in wound dressings for its antibacterial properties. These applications demonstrate the versatility and importance of metals in healthcare.

Why is "Saying aluminium is used because it's very strong" a common mistake in Uses of Metals?

Why it happens: Default property. How to avoid it: Aluminium isn't especially strong — it's used for LOW DENSITY and corrosion resistance. Source: 0620/42 — recurring

Why is "Saying pure metals are stronger than alloys" a common mistake in Uses of Metals?

Why it happens: Confusion about purity. How to avoid it: Alloys are usually STRONGER and HARDER than the pure parent metal.

Why is "Listing a use without justifying with a property" a common mistake in Uses of Metals?

Why it happens: Speed. How to avoid it: Examiner needs PROPERTY → USE: 'low density → aircraft', not just 'aircraft'.

MetalsCambridge IGCSE Chemistry (0620)

Uses of Metals

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Uses of Metals — Cambridge IGCSE 0620 Chemistry Extended (2026)

Why we use copper for wires, aluminium for aircraft, mild and stainless steel for cars and cutlery. Each use depends on a property: conductivity, density, strength, corrosion resistance.

What you’ll learn

Mapped to the Cambridge IGCSE 0620 syllabus (2026-2028).

11.4 — Describe the uses of common metals and alloys.
11.4 — Relate the use of a metal/alloy to its properties.

Match property to use

Each metal's use is dictated by a few key properties.

Copper.

Property: excellent electrical conductor (best after silver, but cheaper); ductile; corrosion-resistant; doesn't react with water.
Uses: electrical wires, water pipes, cooking pots (good thermal conductor).

Aluminium.

Property: low density (light); good electrical and thermal conductor; corrosion-resistant (oxide layer); ductile.
Uses: aircraft (light → less fuel), overhead power cables (light + conductive — supported on pylons), drinks cans (oxide layer keeps drink fresh), foil for cooking (ductile, conductive).

Mild steel (iron with $\sim 0.2\%$ carbon).

Property: strong, easily welded, malleable, cheap.
Uses: construction beams, car bodies, ships, machinery.

Stainless steel (Fe + Cr + Ni).

Property: corrosion-resistant (Cr₂O₃ layer protects), hard, strong.
Uses: cutlery, sinks, surgical instruments, kitchen surfaces.

Brass (Cu + Zn).

Property: hard (harder than pure Cu), attractive yellow shine, doesn't tarnish much.
Uses: musical instruments, door handles, fittings, screws.

Zinc.

Property: more reactive than iron (sacrificial protection), low m.p., low cost.
Uses: galvanising (coating iron to prevent rust), batteries (zinc-carbon), brass.

Worked qualitative. Why is copper used for water pipes but iron isn't, despite iron being cheaper? Iron rusts in contact with water; copper doesn't react. Maintenance cost of iron pipes (replacing rusted sections) outweighs the material savings.

Worked qualitative. Why is aluminium chosen over steel for aircraft wings? Aircraft must be LIGHT. Aluminium has $1/3$ the density of steel, while still being strong enough (especially as an aluminium alloy like duralumin). Lighter aircraft = less fuel = lower running cost.

Cu: wires, pipes (conductivity, doesn't react with water).
Al: aircraft, cans (low density, corrosion resistance).
Mild steel: construction, cars (strong, cheap, weldable).
Stainless steel: cutlery, surgical instruments (corrosion-resistant).
Brass: instruments, fittings (hard, attractive).
Zn: galvanising, batteries.

Why properties matter — engineering context

Engineering choices balance cost, weight, corrosion, strength, conductivity.

Engineering trade-offs. Engineers don't just pick the "best" metal — they balance:

Cost (mild steel cheap; titanium expensive).
Weight / density (aircraft want light; steel girders don't care).
Corrosion resistance (outdoor structures need it; indoor furniture doesn't).
Strength (load-bearing applications need high strength).
Conductivity (wires, cookware).
Recyclability (modern environmental driver).

Worked qualitative. Why are overhead power cables aluminium, NOT copper, despite copper being a better conductor? Aluminium is much LIGHTER. Long spans between pylons can sag/break under copper's weight. Aluminium's slightly worse conductivity is offset by using thicker cables. Total cost: lower with aluminium.

Cambridge tip. When asked "why is X used for Y?", give TWO or THREE properties that make X suitable for Y. Don't just say "it's good".

Worked qualitative. A student is asked: "Suggest a metal for the cooking surface of a frying pan." Answer should mention:

Good thermal conductor (transfers heat to food).
High m.p. (won't melt at cooking T).
Corrosion-resistant (food and water won't ruin it).
Strong (handles knocks). Possible choices: stainless steel, anodised aluminium, copper-bottomed steel.

Engineering balances cost, weight, corrosion, strength.
Power cables: aluminium chosen over copper for weight.
Cookware: balance conductivity, corrosion, strength.
Specify TWO+ properties when explaining a use.

How it’s examined

Uses of metals appear most years on Paper 2 (3-5 marks: match property to use). Examiner reports flag students giving generic answers — Cambridge wants the SPECIFIC property that makes the metal useful for that purpose.

Sources: Cambridge IGCSE Chemistry 0620 syllabus 2026-2028 (11.4); 0620/22 May/Jun 2024 — Q14 (uses of metals); 0620 Examiner Reports 2022-2024. Last reviewed 2026-05-07.

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Step-by-step worked examples — Uses of Metals

Step-by-step solutions to past-paper-style questions on uses of metals, written exactly the way a tutor would explain them at the board.

1Why aluminium is used in aircraft and overhead cables
Core• aluminium
Question
State two reasons aluminium is used in aircraft and overhead power cables.
Step-by-step solution
1. Step 1
  LOW density → light → fuel-efficient airframes.
2. Step 2
  Good electrical conductor + resists corrosion (oxide layer).
Answer
Low density, good conductor, corrosion-resistant.
2Why copper is used in electrical wiring
Core• Adapted from 0620/22 May/Jun 2024 Q15• copper
Question
State two properties that make copper suitable for electrical wiring.
Step-by-step solution
1. Step 1
  Excellent electrical conductor.
2. Step 2
  Ductile → can be drawn into long thin wires.
Answer
High conductivity + ductile.
3Why mild steel is used for car bodies
Extended• steel
Question
Explain why mild steel is used for car bodies.
Step-by-step solution
1. Step 1
  Strong AND ductile → can be shaped into panels.
2. Step 2
  Cheaper than pure iron, harder than pure iron.
Answer
Strong, malleable/ductile, relatively cheap.
4Why stainless steel is used for cutlery
Extended• alloy
Question
Explain why stainless steel (Fe + Cr + Ni) is preferred over pure iron for cutlery.
Step-by-step solution
1. Step 1
  Chromium creates a passive oxide layer → CORROSION-RESISTANT.
2. Step 2
  Hard, hygienic, easy to clean.
Answer
Resists rust + hard + easy to clean.

Key Definitions and Keywords — Uses of Metals

Definitions to memorise and the exact keywords mark schemes credit for uses of metals answers — sharpened from recent examiner reports for the 2026 0620 sitting.

Mild steel
Examiner keyword
Iron + small amount of carbon ( $<0.25\%$ ). Strong yet ductile.
Stainless steel
Examiner keyword
Iron with chromium (and often nickel). Corrosion-resistant due to Cr oxide layer.
Brass
Examiner keyword
Copper + zinc alloy. Hard, golden, used in fittings and instruments.

Common Mistakes and Misconceptions — Uses of Metals

The traps other students keep falling into on uses of metals questions — taken from recent Cambridge IGCSE 0620 examiner reports and mark schemes — and how to avoid them.

✕Saying aluminium is used because it's very strong
0620/42 — recurring
Why it happens
Default property.
How to avoid it
Aluminium isn't especially strong — it's used for LOW DENSITY and corrosion resistance.
✕Saying pure metals are stronger than alloys
Why it happens
Confusion about purity.
How to avoid it
Alloys are usually STRONGER and HARDER than the pure parent metal.
✕Listing a use without justifying with a property
Why it happens
Speed.
How to avoid it
Examiner needs PROPERTY → USE: 'low density → aircraft', not just 'aircraft'.

Practice questions

Exam-style questions with step-by-step worked solutions. Try one before checking the method.

Past paper style quiz

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Uses of Metals — frequently asked questions

The things students keep getting wrong in this sub-topic, answered.

Uses of Metals

Short Study Notes in the form of Slides

Detailed Study Notes

What you’ll learn

How it’s examined

1Why aluminium is used in aircraft and overhead cables

2Why copper is used in electrical wiring

3Why mild steel is used for car bodies

4Why stainless steel is used for cutlery

Mild steel

Stainless steel

Brass

✕Saying aluminium is used because it's very strong

✕Saying pure metals are stronger than alloys

✕Listing a use without justifying with a property

Practice questions

Past paper style quiz

Assess your understanding

Video lesson

Uses of Metals — frequently asked questions