CIE AS Chemistry (9701) exams from 2022

Revision Notes

1.4.1 Gas Pressure

Gases: Gas Pressure

  • Gases in a container exert a pressure as the gas molecule are constantly colliding with the wall of the container

 

States of Matter Pressure, downloadable AS & A Level Chemistry revision notes

Gas particles exert a pressure by constantly colliding with the walls of the container

Changing gas volume

  • Decreasing the volume (at constant temperature) of the container causes the molecules to be squashed together which results in more frequent collisions with the container wall
  • The pressure of the gas increases
  • The volume is therefore inversely proportional to the pressure (at constant temperature)
    • A graph of volume of gas plotted against 1/pressure gives a straight line

 

States of Matter Volume and Pressure, downloadable AS & A Level Chemistry revision notes

Decreasing the volume of a gas causes an increased collision frequency of the gas particles with the container wall (a); volume is inversely proportional to the pressure (b)

Changing gas temperature

  • Increasing the temperature (at constant volume) of the gas causes the molecules to gain more kinetic energy
  • This means that the particles will move faster and collide with the container walls more frequently
  • The pressure of the gas increases
  • The temperature is therefore directly proportional to the pressure (at constant volume)
    • A graph of temperature of gas plotted against pressure gives a straight line

States of Matter Temperature and Pressure, downloadable AS & A Level Chemistry revision notes

Increasing the temperature of a gas causes an increased collision frequency of the gas particles with the container wall (a); temperature is directly proportional to the pressure (b)

Author: Francesca

Fran has taught A level Chemistry in the UK for over 10 years. As head of science, she used her passion for education to drive improvement for staff and students, supporting them to achieve their full potential. Fran has also co-written science textbooks and worked as an examiner for UK exam boards.
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