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2 marksPhases of Matter

CSEC Physics · 1991 · Paper 2 · Question 2(a)(i)

An experiment demonstrates Brownian motion using graphite particles suspended in water observed under a microscope illuminated by a line filament lamp and glass rod.

Describe what is seen through the microscope when observing the illuminated graphite particles for a few seconds.

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Other parts of this question

  1. 2(a)(ii)State what change in observation would occur if warmer water were used instead.[1 mark]
  2. 2(a)(iii)State the conclusions that can be drawn from these observations.[2 marks]
  3. 2(b)The average speed of a perfume molecule at room temperature is approximately 100 m/s, but the scent travels across a room much more slowly. Explain this…[3 marks]
  4. 2(c)(i)Explain why adding more air into a car tyre increases its internal pressure.[2 marks]
  5. 2(c)(ii)Explain why the pressure in a car tyre increases when it gets hot.[2 marks]
  6. 2(d)Nitrous oxide gas inside a cylinder exerts a pressure of 5.0 × 10⁵ Pa at 17 °C. Calculate its new pressure when heated to 37 °C before use.[4 marks]

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