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Learning objective

Explain that mass is conserved when a substance changes state.

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Topic

Changes of state and the particle model

Subtopic

Changes of state

Aqa Gcse PhysicsParticle model of matter

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Quick explanation

Explain that mass is conserved when a substance changes state

  • This point belongs to Changes of state and the particle model, especially Changes of state.
  • You need to be able to explain that mass is conserved when a substance changes state.
  • The key ideas to know are that, conserved, and substance.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

thatconservedsubstancemasswhen

Why it matters

This objective helps connect Changes of state to exam-style questions, flashcards, and revision notes for Changes of state and the particle model.

Quick student answer

How do you explain mass is conserved when a substance changes state?

Direct answer

In Physics, this page helps you answer questions about mass is conserved when a substance changes state within Changes of state and the particle model. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are mass conservation and change of state.

Key terms

  • mass conservation: The principle that the total mass of a closed system remains constant over time, regardless of the processes acting inside the system.
  • change of state: The transformation of a substance from one state of matter (solid, liquid, gas) to another, which involves energy transfer but does not change the substance's mass.

Common trap

Mass Conservation Misunderstanding: Emphasize that mass is conserved during changes of state, meaning the total mass before and after the change remains the same.

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