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Closed System - GCSE Chemistry Definition

Reviewed by: Philippa Platt

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A closed system in chemistry is a setup where no matter can enter or leave, but energy, like heat, can still move in and out. Imagine a sealed container where a chemical reaction is happening. The substances inside can't escape or mix with anything outside, but the container can still get hotter or cooler.

This is important in experiments because it helps us measure changes accurately without anything else interfering. Knowing about closed systems allows students to better understand how reactions are controlled and observed.

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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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