CIE AS Chemistry

Revision Notes

Syllabus Edition

First teaching 2020

Last exams 2024

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1.4.1 Gas Pressure

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Gases: Gas Pressure

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

States of Matter Pressure, downloadable IB 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)

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Fran studied for a BSc in Chemistry with Forensic Science, and since graduating taught A level Chemistry in the UK for over 11 years. She studied for an MBA in Senior Leadership, and has held a number of roles during her time in Education, including Head of Chemistry, Head of Science and most recently as an Assistant Headteacher. In this role, she used her passion for education to drive improvement and success for staff and students across a number of subjects in addition to Science, supporting them to achieve their full potential. Fran has co-written Science textbooks, delivered CPD for teachers, and worked as an examiner for a number of UK exam boards.