A gas is stored in a container with a frictionless, moveable piston so that its pressure remains constant. The temperature of the gas is increased, causing its volume to expand.
What happens to the gas molecules during this volume expansion?
The average kinetic energy of the molecules increases and their average separation increases.
The average kinetic energy of the molecules remains constant and their average separation increases.
The average kinetic energy of the molecules increases and their average separation decreases.
The average kinetic energy of the molecules decreases and their average separation increases.
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.