A sealed glass flask contains nitrogen gas at a temperature of 80∘C80^\circ\text{C}80∘C. No gas can escape or enter the flask.
Describe the arrangement, separation, and motion of the nitrogen molecules inside the flask.
The flask is placed in an ice bath, causing the temperature of the nitrogen gas to decrease to 0∘C0^\circ\text{C}0∘C.
Describe the changes in the motion and energy of the nitrogen molecules as the temperature 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.