Alloys

• Chemistry
• Secondary Education

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Topic 7 - Metals

Alloys

13 November 2025

How do you feel today?

😒🙁😐🙂😃

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• I will know the structure and special properties of alloys.
• I will understand why stainless steel is harder and stronger than pure iron.
• I will be able to write one reason why alloys are harder and stronger.

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Choose one iPhone chassis. Give one reason why you have chosen that option.

Choose one iPhone chassis. Give one reason why you have chosen that option.

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Alloys

An alloy is a metal which has been mixed with small amounts of other elements (usually metals) to give it special properties.

Steel

Brass

Solder

Amalgam

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Steel

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Steel

What metals mix to form stainless steel?

1. zinc and iron
2. iron and copper
3. iron and carbon
4. iron and chromium

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Stainless Steel

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Brass

What metals mix to form brass?

1. zinc and iron
2. zinc and copper
3. zinc and carbon
4. zinc and chromium

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Brass

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Solder

tin-lead solder

zinc-lead solder

What metals mix to form solder for repairing 

galvanised coatings?

1. lead and iron
2. zinc and lead
3. chromium and lead
4. tin and lead

What metals mix to form solder wire?

1. iron and lead
2. zinc and lead
3. chromium and lead
4. tin and lead

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Solder for repairing galvanised coatings

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Solder wire

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Amalgam

dental amalgam 

amalgam with gold and silver

back of a mirror

Thallium amalgam thermometer

What metals mix to form dental amalgam?

1. mercury and silver or tin
2. mercury and lead
3. mercury and iron
4. mercury and zinc

What metals mix to form the back of a mirror amalgam?

1. mercury and zinc
2. mercury and lead
3. mercury and iron
4. mercury and tin

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Dental amalgam

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Dental amalgam

Give at least one property of alloys that 

makes them different from pure metals.

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Why is stainless steel harder, stronger, and more resistant to corrosion than pure iron?

dent

aluminium chassis

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Why is stainless steel harder, stronger, and more resistant to corrosion than pure iron?

scratches only

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Work in pairs: Complete Activity 3 - Alloys.

TEMPLATE

• I will know the structure and special properties of alloys.
• I will understand why stainless steel is harder and stronger than pure iron.
• I will be able to write one reason why alloys are harder and stronger.

How well did you enjoy the lesson today?

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