A gas in a sealed, flexible container is cooled while maintaining a constant pressure. What happens to the molecules of the gas?
The average distance between molecules increases.
The average kinetic energy of the molecules decreases.
The number of molecules in the container decreases.
The mass of each individual molecule decreases.
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.