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1.1 The particle model

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Question 14
F

At atmospheric pressure, solid carbon dioxide changes directly into a gas at −78 ∘C-78\,^\circ\mathrm{C}−78∘C. This change is called subliming.

Statement 1: The particles take in energy from the surroundings.

Statement 2: Subliming is a chemical change because no liquid forms.

Statement 3: The particles change from vibrating about fixed positions to moving randomly.

Statement 4: The particles become larger as they become a gas.

Which statements are correct?

[1]
A

1 and 3 only

B

1, 3 and 4 only

C

2 and 3 only

D

1, 2 and 3 only

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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