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1.1 The particle model

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Question 10

An aquarium pump pushes air through the water in a fish tank, and a stream of bubbles rises to the surface. Tests show that the gas in the bubbles is the same as the air entering the pump. Why does this bubbling not show that a chemical change has taken place?

[1]
A

The bubbles are particles of the water escaping from it as a gas

B

The water is not being heated, so no reaction is able to happen

C

Switching off the pump stops the bubbles, so the change is reversible

D

The bubbles contain no substance that was not already present before

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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