Complete the sentences about the kinetic molecular model of gases:
(i) Gas molecules travel at high speeds in constant, ............................................................ directions. (ii) Except during collisions, the forces between the molecules of an ideal gas are ............................................................ . (iii) A gas exerts a pressure on the container walls because the moving molecules ............................................................ with the walls. (iv) If the temperature of a gas in a constant volume container increases, the speed of its molecules increases, which causes the pressure to ............................................................ .
The Kelvin (absolute) temperature scale is defined relative to absolute zero.
(i) State the temperature of absolute zero in degrees Celsius (∘C^\circ\text{C}∘C).
Lowest possible temperature = .................................... ∘C^\circ\text{C}∘C (ii) State the value of the freezing point of water (0 ∘C0\ ^\circ\text{C}0 ∘C) in kelvin (K\text{K}K).
Freezing point of water = .................................... K\text{K}K
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.