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1.1 The particle model

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Question 1

A teacher uses identical marbles in two trays to model two different substances, P and Q. To show P changing from a liquid to a gas, she spreads the marbles for P far apart. To show Q changing from a gas to a liquid, she pushes the marbles for Q together until they touch.

Statement 1: Using marbles of one size for both P and Q cannot show that particles of different substances can have different sizes.

Statement 2: Larger marbles should be used for gaseous P because P takes up more space as a gas.

Statement 3: The model should show air particles in the spaces between the marbles for gaseous P.

Statement 4: Pushing the marbles for Q together does not show the energy released as Q condenses.

Which of the statements are valid criticisms of the demonstration as a model of real particles?

[1]
A

1 and 4 only

B

3 and 4 only

C

1 and 2 only

D

1, 2 and 4 only

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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