P3: Particle Model & Pressure Physics GCSE

• What is the state of molecules in a gas according to the kinetic theory?

  They are in constant random motion at high speeds
• How is the temperature of a gas related to the kinetic energy of its molecules?

  The temperature relates to average kinetic energy
• What happens to the average kinetic energy of a gas as its temperature increases?

  The average kinetic energy increases
• What occurs to the average kinetic energy of a gas when its temperature decreases?

  The average kinetic energy decreases
• What does random motion of gas molecules imply about their movement?

  Molecules travel in no specific path
• What is Brownian motion?

  Random motion of tiny particles in a fluid
• How does the motion of gas molecules change with temperature and pressure?

  It changes according to temperature and pressure
• What happens to the average speed of gas molecules as temperature increases?

  The average speed of the molecules increases
• How does the kinetic energy of gas molecules change if the volume remains constant?

  Kinetic energy increases with speed
• How is pressure defined in a gas?

  Force exerted per unit area of the container
• What happens to gas molecules in a container when they collide with the walls?

  They exert pressure on the walls
• What does high pressure in a gas indicate about molecular collisions?

  More frequent collisions with container walls
• What occurs to gas molecules when the gas is heated?

  Molecules travel at a higher speed
• How does an increase in temperature affect the pressure of a gas at constant volume?

  It increases the pressure due to more collisions
• What does Diagram A illustrate about gas molecules and temperature?

  Molecules collide more with increased temperature
• What does the graph between temperature and pressure indicate?

  The graph is a straight line indicating proportionality
• What is required when describing the links between pressure & volume and pressure & temperature?

  Correct use of terms like collision and kinetic energy
• What does kinetic theory explain about gases?

  Kinetic theory explains gas behavior.