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1.1 The particle model

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Question 8

Hot gaseous samples of two substances, X and Y, are cooled at the same pressure. The temperature of each sample is measured every minute.

SubstanceBoiling point (∘C^\circ\mathrm{C}∘C)Melting point (∘C^\circ\mathrm{C}∘C)
X46−95
Y23046

After several minutes, both samples are at 46 ∘C46\,^\circ\mathrm{C}46∘C. The temperature of each sample stays at 46 ∘C46\,^\circ\mathrm{C}46∘C for a while before it falls again.

Which statement describes what is happening in the samples while their temperatures stay at 46 ∘C46\,^\circ\mathrm{C}46∘C?

[1]
A

X is freezing and Y is completely solid.

B

X is freezing and Y is condensing.

C

X is condensing and Y is freezing.

D

X is completely liquid and Y is condensing.

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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