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1.1 The particle model

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Question 6

A sample of oxygen gas is cooled until it becomes liquid oxygen. The liquid is then warmed until it is a gas again.

A student makes two conclusions:

  1. No chemical change occurred when the liquid formed.
  2. The ability to recover the starting material is a reliable test for deciding whether any change is physical or chemical.

Evaluate both of the student's conclusions.

[3]
Markscheme

1.1 The particle model Questions

  1. GCSE
  2. /Chemistry
  3. /1.1 The particle model

93 exam-style questions on OCR GCSE Chemistry 1.1 The particle model, covering 1.1.1 The particle model and changes of state and 1.1.2 Limitations of the particle model. Each one has a worked solution and a mark scheme showing where the marks go.

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