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Alloy - GCSE Chemistry Definition

Reviewed by: Philippa Platt

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What is an alloy?

In GCSE Chemistry, an alloy is a mixture of two or more metals or a metal with a non-metal, such as carbon. 

Alloys often have properties that can be very different from the metals they contain. They are usually stronger and more resistant to corrosion and extreme temperatures. This often makes them more useful than the pure metallic element.

Why are alloys harder than pure metals?

Alloys are harder than pure metals because they contain atoms of different sizes. This causes the regular arrangements of atoms to become distorted. So, it is more difficult for the layers of atoms to slide over each other. 

Alloy structure

Diagram of a lattice structure showing blue circles as Element X and red circles as Element Y.
The regular arrangement of a metal lattice structure is distorted in alloys

Alloy Revision Resources to Ace Your Exams

For more information about alloys, check out our revision notes on alloys. You can also practise our exam questions to ensure success. Our flashcards on uflashcards on the wider topic of using materialssing materials are also a great way to revise before an exam.  

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Philippa Platt

Reviewer: Philippa Platt

Expertise: Chemistry Content Creator

Philippa has worked as a GCSE and A level chemistry teacher and tutor for over thirteen years. She studied chemistry and sport science at Loughborough University graduating in 2007 having also completed her PGCE in science. Throughout her time as a teacher she was incharge of a boarding house for five years and coached many teams in a variety of sports. When not producing resources with the chemistry team, Philippa enjoys being active outside with her young family and is a very keen gardener

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