Kinetic theory and gas behaviourIB MYP Physics: Mind map

Exam questions on Kinetic theory and gas behaviour

1. A cyclist in Amsterdam leaves a sealed bicycle tyre in the sun. The volume of the tyre stays the same, but the temperature of the air inside it rises from 15 °C to 45 °C.
   Explain why the pressure inside the tyre rises as the temperature rises.2 marks
2. A bicycle pump contains 120 cm³ of air at a pressure of 100 kPa. The outlet is blocked, and the piston is pushed in slowly until the air occupies 40 cm³. The pump is pushed in slowly, so the temperature of the air stays constant.
   The piston is pushed in further, until the volume is 30 cm³. Calculate the new pressure.2 marks
3. A class in Auckland investigates how the pressure of a fixed mass of air changes with its temperature. Air is sealed in a rigid flask connected to a pressure gauge, and the flask is heated in a water bath. The pressure is 100 kPa at 20 °C, 107 kPa at 40 °C, 114 kPa at 60 °C and 121 kPa at 80 °C.
   State a testable hypothesis for this investigation and give a scientific reason for it.3 marks