Chemistry GCSE
Closed System
What Closed System means in Chemistry GCSE, as defined for OCR, Pearson Edexcel.
Definitions of Closed System
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
A system in which no substances can enter or leave during a reaction.
A system where no substances can enter or leave during a reaction.
Topics that use Closed System
- Topic C5: Monitoring and controlling chemical reactions (OCR GCSE)
- Extracting metals and equilibria (Pearson Edexcel GCSE)
Related terms
- Dynamic Equilibrium
- Activation Energy
- Catalyst
- Endothermic Reaction
- Exothermic Reaction
- Mole
- Atom Economy
- Le Chatelier's Principle
Using Closed System in the exam
Definition questions usually carry one or two marks, and examiners look for the precise wording. Write the definition from memory, check it against the version above, and then use the term in a longer answer on the same topic so it sticks.
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