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1.1 The particle model

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Question 19
F

A student classifies two changes.

Change 1: A large crystal of salt is ground into a fine powder. The powder is still salt, but the large crystal cannot be put back together.

Change 2: Substance X changes into a new substance, Y. Later, Y is changed back into X.

The student says: "Change 1 is chemical because it cannot be reversed. Change 2 is physical because it can be reversed."

Which response is correct?

[1]
A

The student is correct, because whether a change can be reversed decides how it is classified.

B

Both changes are physical, because salt remains after Change 1 and X is recovered after Change 2.

C

Change 1 is physical and Change 2 is chemical, because only Change 2 forms a new substance.

D

Both changes are chemical, because the particles are rearranged in both changes.

Markscheme

1.1 The particle model Questions

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

48 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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